Strategy Developer 9.4.x - 10.x do not have an administration task to purge object caches, as illustrated below:

However, administrator can use a script to purge object cache in Strategy Command Manager and schedule the script in the Windows Scheduler. Follow the steps below:
PURGE OBJECT CACHING IN PROJECT "Project_Name";
cmdmgr -n "Project_Source_Name" -u Administrator -f C:\PurgeObjectCache.scp -o C:\CommandManagerOutput.txt