Hello Denis,
Thank you for your respond. Actually I am doing in the same way as you did. I am using screws instead for bolts but one disadvantage is unrealistic stress image around the middle hole (in the middle plate). In my opinion Creo should have possibility to calculate three or more plates screwed up with bolts (fasteners). In real life two plates screwed up with bolts is rather rare situation.
Best regards,
Piotr