This Tutorial is about using Mootilda's Grid-Adjuster to create No-Slope Basements and 1-Click or 2-Click Foundations

YOU WILL NEED
Mootilda's Grid-Adjuster Tool ...obviously!
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AND I SUGGEST READING
Moo's own G-A Tutorial
Shasta's Little Decks Tutorial
Or my other G-A Tutorial Basic 2-Click Foundations and/or Flat Roofs - similar to Shasta's Tute, but with a different approach.
Honeywell and Moo's conversation: HERE
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YOU WILL ALSO NEED
HL's SimplePassageModStairs (Version 2)
BECAUSE
HL and Moo's convo/thread about the stairs: HERE
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The first part of this tutorial, Steps #1 - 14, is for making the No-Slope Basement.
Once that is done, and the appropriate stairs are added to the 4-click foundation, then you can decide if you want a 2-Click or 1-Click (or 3-Click) Foundation.

Steps #15 - 22 are for making the 2-Click Foundation. If you really want a 1-Click Foundation - skip ahead to the next section. You do not need to have a 2-Click Foundation before changing it to a 1-Click Foundation. If you plan on allowing large dogs access to your building, then you must put HL's SimplePassageModStairs in place on a 4-click foundation BEFORE changing it to a 2-Click Foundation.

Steps #23 - 29 are for making the 1-Click Foundation. You must put invisible stairs in place on a 4-click foundation BEFORE changing it to a 1-Click Foundation. I like HL's SimplePassageModStairs V2 - they were specifically designed for lower foundations - and they are the ONLY stairs that allow large dogs to enter on a lowered foundation.
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A "Steps" summary is given at the end - the main tutorial is presented in the following 21 pictures:
I also have a download available of this Bin House with these three Grid-Adjuster variations. With just the No-Slope Basement, with the No-Slope on a 2-Click Foundation, or with the No-Slope on a 1-Click Foundation.


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Steps:
1 - The building must have a foundation
2 - Mark out the "sections" for counting
3 - Add overlapping areas AND count Depth and Width of sections
4 - Create basement walls and 1st Floor walls (should look like a 2-story house on a foundation. The 1st floor/story will actually be the basement.
5 - Double check your counting!!!
6 - Save lot (Remember the lot's name!) and close TS2
7 - Start the Grid-Adjuster; find the house
8 - Enter numbers for the first section
9 - Enter numbers for the second section
10 - Enter numbers for the third section
11 - Enter numbers for the fourth section
12 - Close the Grid-Adjuster; Restart TS2
13 - Fix the mess... snap windows/doors/objects back into place
14 - Add stairs. Finish the building.

DONE! ...with adding No-Slope Basement

15 - Prep for 2-Click Foundation - Add HL's SimplePassageModStairs IF you want to allow Large Dogs access to the house
16 - Save. Close TS2.
17 - Start up the Grid-Adjuster; find the house
18 - Enter numbers for each section again in the G-A; this time with Elevation:  -14 (for a 2-Click Foundation)
19 - Close the G-A; Restart TS2
20 - Add in-game steps where you want 2-step stairs.
21 - Invisify HL's SimplePassageStairs (if you used them)
22 - Fix the mess... snap windows/doors/objects back into place.

DONE! ...with adding No-Slope Basement AND a 2-Click Foundation

23 - Prep for 1-Click Foundation - Must add HL's SimplePassageModStairs
24 - Save. Close TS2.
25 - Start up the Grid-Adjuster; find the house
26 - Enter numbers for each section again in the G-A; this time with Elevation:  -15 (for a 1-Click Foundation)
27 - Close the G-A; Restart TS2
28 - Invisify HL's SimplePassageStairs
29 - Fix the mess... snap windows/doors/objects back into place.

DONE! ...with adding No-Slope Basement AND a 1-Click Foundation
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Whew! How did you do?
Please let me know if you have questions - I don't know everything about the Grid-Adjuster (yet!) But, I will try to help if I can.

This tutorial is AWESOME! I can't wait to try this out! Thank YOU for posting this! :lovestruc
The 1-click fondation looks so unique, I LOVE IT!

Thank you
Please let me know if I was unclear about anything? I hope it all makes sense I can get kinda rambly sometimes...

No, actually it was pretty good! :lovestruc
I love how you made it with pictures and all, this is really easy to follow!

YAY! Thank you for letting me know

Thank a lot, I hope can use it.

Do you know if GA can handle diagonal basement tiles?

Hiya Phae
No... I don't believe it can. Or, if it can, I haven't figured it out yet *sigh*

Is a pdf version of this tutorial available for printing for use while in-game?

Rough & ready PDF print uploaded to SFS- hope it's good enough for what you need @rhiamom !
https://simfileshare.net/download/2638741/

Simsample to the rescue!!! Thank you so much for doing that!

Thanks for the tutorial! Do you know if it's possible to create a 0-click foundation as well?

Yes - but they can't enter without using HL's SimplePassage stairs. And... you only need to do that if you want a basement. LOL. Otherwise, just build on the ground without a foundation at all.

Thanks for the quick reply! Then I have another question: is the "nether" you've pictured what happened within the Foundation? I haven't seen a screenshot of the new Basement floor in your OP, hence I wonder this.

The "Nether" is what I call the level under the basement - it is open to the 'sky' of the sims world. The new basement level is the picture right before that one ( #08).
...and yes, that is what happens inside the block of foundation when you use the G-A to create a no-slope basement.