Entering/importing adjusted daily resource allocation

I have a client that works in the P6 Professional.  In the Assignments window they manually adjust the number of hours per day for each assignment. There is no curve that can be applied to duplicate the pattern because the pattern is unpredictable.  The assignment could be Mon 7 hours, Tues 6 hours, Wed 1, Thur 7, Fri 4.  The following week can be completely different.  These daily allocations are generated from another application into an Excel file.  Is there any way, using the P6 GUI or directly accessing the database that will allow them to import the daily allocations