Frompre- +‎populate.

prepopulate (third-person singular simple presentprepopulates,present participleprepopulating,simple past and past participleprepopulated)

1. (transitive,computing) Topopulate (form fields, a database, etc.)in advance.

   Hyponym:warm

   • 2009, Cody Lindley,jQuery Cookbook:

     However, in addition to disabling the billing fields, we are alsoprepopulating them with data from the shipping fields.

• prepopulation