You can try the below example:
NoConcatenate LOAD *
Resident "Sales" //Your sales table name here
//You can then join the temporary table to the History table, for example:
Join("History") //Your history table name.
Drop Table "TEMP_SALE"; //Drop the Temporary sales table from the model after joining.
Hope this Helps,
Assuming you want to keep some way the data you are loading today when you the load tomorrow, I suggest you to take a look at this thread and this other thread on the same issue. That way you will always have your historical data in files (QVD files are, in addition, way too faster to load) and your updated data in the same document, allowing you to perform kind of "incremental load" without using buffer QVDs and having full control on what you save and what you load.
I hope not have missed the point, but there you are my two cents.
Hope that helps.