Is there any way to default the Supplier name or site to all the fields in supplier portal page

Summary:

Is there any way to default the Supplier name or site to all the fields where the Supplier name or site details are required on the Supplier Portal page? Currently, if only one supplier site is available then too it is required to add the site manually, is there any way to default that?

In the attached screenshot there is only one supplier site then too it is needed to select that site manually. Is there any way to default?