Hi @YaroslavSin ,
that will also work, but you need to take a few steps to make it happen.
- Skeleton must be in your active assembly
- Skeleton needs a component parameter called BUW_OBJECT_ROLE value is of your choosing, but for this example I went with "skeleton"
- Use SEARCH_SUBCOMP_REF to find the required reference.
See structure:

See also example code:
BEGIN_ASM_DESCR
SEARCH_MDL_REF THIS_283 CSYS CS0 CSYS_FOUND
SEARCH_SUBCOMP_REF ASSEMBLY SKELETON CSYS CS0 CSYS_TO_ALIGN
CONFIG_ELEM
ASSEMBLE THIS
CSYS CSYS_TO_ALIGN CSYS_FOUND
END_ASSEMBLE
END_ASM_DESCR
PFA also a litte demo component that you can use (Created in Creo 7).
I hope this is what you were looking for.
Greetings Sam