How to Make Supplier Site Mandatory in Redwood Noncatalog Request using VB?

As everyone aware, in 25C version the current SSP is going to be replaced with new Redwood Page.

We have several sandboxes deployed on the current SSP page and need guidance on how to achieve the following important sandbox functionalities using Visual Builder in the Redwood Page:

1. Moving the "Source" table before the "Pricing" area.
2. Making the "Supplier Site" field mandatory.
3. Making the "Supplier Contact" field mandatory.