How to set up Special Pricing Option per size?

Also I cannot work out how to integrate the stock so when people select the item they want and the size it will automatically request the right amount of payment

Hi SAISAinc,

If I understand you correctly, you're trying to add a price per size of the product. If so, you'll need to turn on the Special Pricing Per Option in your product list. It's easy to set up. Let's do it:

1. In Form Builder, click the payment field.

2. Click on the Wand Icon to open the Payment Settings.

3. Hover to one of your product items, and then click on the Gear Icon to Edit it.

4. Click on the Options tab of the selected Product.

5. Click on Pencil Icon of the Size options.

6. Click the Toggle Switch to Yes of the Special Pricing Per Option.

7. Enter the Price per size options.

Check out the screencast below to see my results:

Give it a try and let us know if you need any other help.