On the SysManager > Preferences > Miscellaneous > PA-DSS tab there is a spinner named Prune credit card data out of local Sales data every NNN days. Recommended settings are in the 1 - 45 days range. Local cc_trans records that are that number of days or older are deleted from the data.

 

Note: Previous to version 4.1, this spinner was located on the SysManager > Preferences > Miscellaneous > Sales tab.