AP Invoice Import - additional lines

I have a similar question that is discussed in this thread, but really a bit more general in nature ( 2862622 )

I have a client running 11.5.10. They'd like to start using the AP Invoice Interface (in conjunction with Oracle Supplier Network) to import invoices associated to PO's for specific suppliers. However, there may be additional tax/freight lines. Tax is currently handled manually today and that is the desire going forward, meaning everything defaults taxable to No.

1. What is required to simply accept whatever additional lines are included as part of the import?

2. Is there a way to approve these invoices that were created through the interface, but not subject the manually created ones to the same process? If the answer is AME, what Condition needs to be used/created?