Changes an existing PCB part to an assembly that
can have its own constituent parts.
----(SDPCB_EXPAND_PART)--(:PCBPART)--|part name|---->
- :PCBPART - specifies the name of the part to be expanded.
SDPCB_ADD_PART terminate action
SDPCB_CREATE_PCA terminate action
SDPCB_INQ_PART terminate action
SDPCB_MOVE_PART terminate action
SDPCB_RENAME_PART terminate action