Hi Paul,
There isn't any merge function as such so you will have to cut and paste the various properties from one Sequence File to another.
If you have a lot of sequence file to merge you could develop a sequence that will automate this process by using Teststand API function. The main thing to do here is to Clone one property from one SequenceFile and Insert into a Target SequenceFile. Repeat this for all Sequence, Locals, Parameters, FileGlobals.
A problem will arise with all the 'MainSequence'.
But do you really need to merge these files. You know that you can call SubSequence from external SequenceFiles. (See Computer Motherboard Test.seq found in C:\TestStand\Examples\Demo)
Regards
Ray Farmer