RE: Connect a User to Multiple Opportunities
1.Dynamic solution:
On your Account create a user lookup>>Account Manager
Now, Go to settings>>Processes>>New>> Entity=Opportunity + Trigger when created on or Account/Potential Customer field changes
Check condition>> If Account/Potential Customer contains data and
Account/potential customer's Account Manager contains data
Action: Assign opportunity to Account {Account Manager}
2.If you want to do it for just one customer:
go to settings>>Processes>>New on demand workflow
if Opportunity's Account/Potential Customer = ABC Company
Assign opportunity to Yem94
now advanced find, all opportunities where account/potential customer=ABC Company and then hit the run workflow button