## Square in a Square Block Unit in PreQuilt
**Square in a Square** can be created few different ways in PreQuilt. The easiest way to build it in PreQuilt is outlined below. This construction method will also enable PreQuilt to auto recognize this block unit and calculate your fabric for you.
And since the idea behind this series is to build a block unit (not an entire block that is just a square in a square), I'm going to create a 12" finished block that is made up of multiple square in a square block units (like for example, the **Broken Sash** quilt block).
***
### YouTube Video
*Coming soon...*
***
### Help Guide
1. Click on the **BLOCKS tab** on the left side control panel.
2. Click on the **Make Custom Block** button.
3. The **Block Editor panel** will slide out and overtake your screen. My block is set to 12" x 12" finished, but it doesn't matter, the next steps will work for all sized blocks.
4. Set your grid guidelines by changing the number for the horizontal and vertical units.
* Since I'm going to be creating a **Broken Sash** quilt block, I'll set my gridlines to 4 horizontal and 4 vertical units.
5. Click on the **square shape** () from the central control panel.
6. **Move** the square piece so it is in the top left corner of the quilt block.
7. To manipulate the square to enlarge it, **grab** the square on one of the corners of the square and **drag** it until the square fills the height and width of 2 horizontal and vertical grid spaces.
* Note: If the snap to grid is turned on (default) then the shape will automatically fill the grid space.
8. Click on the **half square triangle shape** () from the central control panel.
9. Click on the **Link button** for a different fabric link (so that there are now 2 different fabrics being used). In this example, I am using Fabric Link B.
10. **Move** the half square triangle piece into the bottom left corner of the square. It should cover the square.
11. To continue building the Broke Sash block, click on the **Clone button** () on the central control panel.
12. Click on the **Rotate button** () on the central control panel so that it is in the correct orientation.
13. **Move** the new HST piece into one of the other corners to continue covering the square.
14. **Repeat** Steps 11-13 until you have all the corners of the orange square have been covered and you have 1 Square in a Square block unit completed.
1 x Square in a Square block unit
Broken Sash Quilt Block with 4 Square in a Square block units
***
## Sewing Construction Diagrams
### 1 at a Time - Snowball Method
{% file src="" %}
### 1 at a Time - Subcut Method
{% file src="" %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://help.prequilt.com/prequilt-101/build-a-block-unit-for-the-fabric-calculator/rectangular-units/square-in-a-square.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
) from the central control panel.
) from the central control panel.
