This guide requires Specify 7.7 or later!
This tutorial will show you how to make a Record Set from a subset of items in a Record Set.
Step 1: Find the record set you want to make a subset from.
In this case, I am going to export the Record Set named Sorted Record set.
Step 2: Open the Record Sets menu from the navigation bar.
Step 3: Click on the 
icon to the right of the Record Set name.
Step 4: Click on Query.
Step 5: Select the query that contains all of the fields you wish to export or create a new one by clicking New.
In this case, this collection has a Default Collection Object query to use. I am selecting this option
Step 6: Run your query by clicking Query.
Step 7: Select the items you wish to include in your new record set.
Step 8: Click on Create Record Set. Give it a name and you are good to go!
Now you have a new record set created from the larger record set.