Over the years I have used Leica Ski & Ski Pro, LGO, TGO, TBC, and SPSO to resolve static vectors. All of these could export vectors to a format StarNet could import. These days I am incorporating RTK vecors in adjustments more often than static. These are imported to StarNet using converters that are built in.
For total station data I convert to StarNet using on e of StarNet available converters. These days I'm using StarTDS to convert Spectra Precision Survey Pro raw files. In the past I've used StarTSC to convert Access .dc files to StarNet.
I process GNSS baselines in TBC. Then I export a TDEF file with the post processed vectors in it. If I followed a TBC friendly workflow then I process everything in TBC (essentially first setup on a GNSS point back sighting another GNSS point).
If I'm processing in StarNet then I take the RW5 file I always create on the TSC2 and use the StarNet TDS converter to make the DAT file. StarNet has a GPS import routine under the input menu.
Most of my Surveys are fairly small so I usually hold one OPUS solution fixed and use the others as a check. The GNSS vectors control direction.