If you created a Bill in NetSuite and it doesn't show in ApprovalMax after synchronisation, please follow these steps:
Make sure the respective workflow is active:
Check that all Bills in NetSuite have actually been submitted for approval (i.e. they have the Pending Approval status in NetSuite).
Click on the Synchronisation icon
in the top right-hand corner (to sync documents between NetSuite and ApprovalMax):
Check the Bills folder.