Allow individual items as "Billable Expense" on an Itemized (split) expense entry; leaving an option for the whole transaction to be billable. If I recall, all items in a split transaction have to be included on the Invoice, and cannot be separated.

I create itemized (split) expense transactions so as to consolidate/"clean up", and closely reflect the invoice from my vendor, without having multiple lines with the same Date, Expense Account, Reference #, and Customer.

In theory, I would have one transaction line showing "(split)" in the Expense Account, and the sum total for Amount. (see example below)

EXAMPLE:
Date Expense Account Reference# Customer Name Status Amount
July 4, 2017 IT Hardware 9455 (none) NON-BILLABLE $47.49
July 4, 2017 (Split) 1415 (none) NON-BILLABLE $546.36
July 4, 2017 IT Hardware 1415 FavCustomer UNBILLED $69.98
[ex:
July 4, 2017 (Split) 1415 (FavCustomer) [1] UNBILLED $586.65]