How can I process invoices that have been GL coded

A suggested workflow to process invoices

Once an invoice has been GL coded and is then is ready to be processed for payment the invoice can be manually marked as "exported". 

To mark the invoice as exported simply view that invoice and then check the box in the top right hand corner (as below)

There is also a filter for this 'export status' in the invoices list so you can view the set of invoices you wish:

This feature allows accounts payable users to mark which invoices have been processed and do not need to be looked at again.