Can project invoices have Line Level settlement OR is it only those invoices created in A/R?
Once you settle payment at a line thru A/R (I was able to do it for Free text invoices), are outstanding lines visible thru some mechanism in A/R or Open transactions?
You can settle the payments per project invoice. What is that you are looking for here?
It will be same. You can see the outstanding/unsettled transactions from Functions=> Settlement.