What are the best practices regarding the association of a bank account to an envelope when using a Quickbooks Cash Account?

When I setup my envelopes I skipped the section where you can associate a bank account with the envelope. I guess I thought that it would just all roll up to the main Quickbooks Cash account, but apparently it does not. I don't see a way to go back and associate an account to the envelopes I've already setup so I guess I'll have to make new envelopes, transfer the money to those, and delete the old envelopes. Does anyone have any recommendations regarding what to name the fictitious bank accounts? Should I just repeat the same name as the main Quickbooks Cash account or name them the same thing as the envelope name? Also, what to do with account numbers and routing numbers (leave them blank, I guess)? Anyway, would appreciate your thoughts and best practice recommendations! Thanks, Graham