Hi Sharon,
Adagio Invoices allows 2 user defined fields on each line of an invoice. If the commission split is based on who sold which line on the invoice, then this is a place to store the salesperson. You could then use Quik Reports to generate the commission report.
Another approach can be used if two (or more) Sales people are splitting the commission on an entire order. In this case, you need to set up a salesperson "code" that will represent the sales people doubles or triples. Again, use Quik Reports to generate the commission report. For this case, you could also use Softrak's Sales Analysis and do commissions based on whether the invoice has been paid.
Generally, for products that communicate throuh the ACCPAC file structure, Adagio does not interfere with their operation. What modules does Musick's CT replace in Order Entry? Is it a separate Start List product? Does your client require advances against commissions, and commission statements?
Regards