What is the impact of using the Select and Add action of a supplier site bank account?

Summary:

We want to be able to reuse a bank account created under a supplier site to another supplier site.

Content (required):

For our suppliers, we have multiple supplier site. Now, what we want to have for example is the same bank account for more than one supplier site. What we have been doing so far is creating the bank account separately for each site. But we just recently found that there is the Select and Add action in the supplier site page.

Now, we want to know how this impacts the Supplier, the supplier sites involved and existing transactions as a whole. We tried proceeding with it on lower environment, but we want to understand how this will impact everything related.