ONLY if certified by the aircraft commander, i.e the logbook must be signed - otherwise it does not count - and you don't want your application sent back because of this.
Appendix B of Section A refers Page 44 to be exact regarding logging of flight time.
This has been covered multiple times before; a simple search on this forum brought up the answer for me and the follwing :
http://www.pprune.org/professional-p...kill-test.html
As you're a commercial pilot to be I'm going to refrain from providing the section of LASORS you are after regarding the 100 hrs PIC - i.e look it up yourself; it's one of the skills you should have mastered by now; if not - your about to learn it.
Here's a clue though; Section D deals with the Commercial.