Sales Analysis integrates with ACCPAC Plus and ACCESS products. The only requirements are that you have OE and/or QIP and AR installed initially.

If you are speaking of the Softline/AO product "Invoice History", then there is an option to "Scan" Sales data into Sales Analysis from that product already on the menu option. To get there, from the main SR menu, select:

3. Maintain Sales Analysis Data
1. Retrieve Sales Data
4. Scan Sales Data from Other Systems
4. Scan Softline's Invoice History

The "scan" option will allow you to pull in data based on either or both of a Customer Range and Date Range. I am not familiar with the product, but if you actually retain the history, you should be able to scan in everything that is there from start date to current date.

If you have the product installed before you install Sales Analysis, (ie install SR after IH) it should allow the Scan menu option for IH to be enabled.

Hope this helps.
Regards