Ways to default requester name at PO line level for standalone expense POs

Summary:

we are deriving the PO charge account for expense POs based on Requester field at PO line level. But if there are more than 100 lines and updating requester names for each line and then click on rebuild accounts/Actions>validate is time consuming. Is there a way we can default the requester for standalone Expense POs

Content (please ensure you mask any confidential information):

we are deriving the PO charge account for expense POs based on Requester field at PO line level. But if there are more than 100 lines and updating requester names for each line and then click on rebuild accounts/Actions>validate is time consuming. Is there a way we can default the requester for standalone Expense POs