Import SFM into FLEx
Import your SFM file into FLEx
Import it into the empty project that has the model entries, as described in Import into FLEx
Check that the "subentries of senses" look like "variants of senses" in the resulting FLEx project. That is, the parent entries say they have a variant, and the “subentry of sense” entries say they are a variant of something, and there is a sense number specified with the target, for multi-sense entries.
Look at their Variant Types. [Note to Beth: remove or reword this section.]
In Bulk Edit > List Choice, add columns for “Variant Type” and “Variant Of”.
Filter for Non-Blanks in “Variant of” (to find all the variants) and then look in “Variant Type” and see what values are there.
Filter for Blanks in “Variant Type”, and use Bulk Edit to set it to "Unspecified Variant". (Technically, this step is unnecessary, but it makes things more clear, and it is needed for other kinds of import projects sometimes.)
Make a backup after you import it and fix the Variant Types. Keep the model entries in it.
Make a copy of that backup. You will move that in the next step. Leave the original backup where you had it, as a safeguard in case this process doesn't work.