If you find that you would like to create variants for things such as price of a home or square footage of a home - you will want to also update your Order Form so that it can recognize these variants you've added!

The first step is to create the variant within your product:

Then you will want to update your order form by going into the order form where this product would be reflected and click edit. From there you will want to scroll down to the Designer section and click on the Launch Designer button:
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From there you will want to go to the Address Details section and click within it - you can then choose which variant you added to your product - which will then be reflected in your order form.

Once you do this - customers will enter in their value (price or square footage) when inputting an order and then the product requiring variants will only show based on what the customer entered.