How to customize the approval group in external supplier registration to pick up a custom workflow?

Summary:

Our client wants the person who sends the external registration link to the supplier to be the first one to approve the supplier to spend authorized.

Content (required):

Our client wants the person who sends the external registration link to the supplier to be the first one to approve the supplier within the organization. How to customize the approval group to pick up the supplier?

Version (include the version you are using, if applicable):

ERP

Code Snippet (add any code snippets that support your topic, if applicable):