This Condition located on the Admin category tab in Search builder can be used to find multiple people by entering their People ID #s separated by a comma.
The exports from TouchPoint contain the People ID#s. So you could go through a list, selecting multiple PID#s and enter them into this Condition and find just those people in order to send an email, add them to a Tag, and more. Basically, you can do anything that you want from the blue Toolbar once you have your search results.
If you have a list of PID#s, you might instead want to have your System Admin import that column from Excel (copy and paste) using the Batch Action > Tag People IDs. Then you can use the Tag however you wish.
But if you have just a few ID#s, this Condition is perfect to use.