Get latest Configuration

System

Curently our environment is set-up to overwrite the whole workarea when a "get latest" is done with overwrite on. This means that any files that weren't submitted to staging are deleted from the workarea. I've worked on other implementations of teamsite where a get latest with overwrite only overwrite files that have conflicts and leaves any newly created files in the workarea alone (won't delete them). Where/how do I configure this.

For example:

Workarea A has 2 files:
file 1 (different version in staging)
file 2 (only exist in this workarea)

Under current implementation a get latest with overwrite would replace file 1 with the version in staging and delete file 2 because it didn't exist in staging.

What I want is to replace file 1 with the version in staging and leave file 2 alone in the workarea.