@enrodgers if you prefer to use the Travel Allowance modul including itineraries you should consider that itineraries always have a start date and an end date of each trip. The system automatically interprets these dates according to the country's travel allowance configuration. Unfortunately technically it is not possible to "pause" the itinerary in an expense report which leads to the problem that when submitting an expense report weekly, you have to end the itinerary for that week you are submitting. If you changed the TA configuration so that 100% instead of 75% would be paid on the starting and end date of each trip - which is technically possible -, this would also effekt the trips which are shorter than one week. Besides that this change could possibly lead to a mismatch between the legally allowed travel allowances and the ones your are actually paying.
However, there are several workarounds which could possibly solve your problem:
1. If your employees already know the return date - even if it is in the future -, they can create and submit the itinerary including the actual start and end date in advance.
2. You could make an advance payment to your employees and the employee submits the itinerary after his or her return for the complete trip. Then you just need to offset the payment with your advance payment.
3. Consider @KevinD 's proposal by using new expense types. However, from my personal experience you could possibly get problems explaining this to your employees and it could end up in a decrease of the user acceptance.
