[haze_ryder]

Hello,
I am currently designing a flow cylinder. It has two small inlet and outlet cylinders(horizontal) and one main cylinder(vertical) into which air will enter through the inlet cylinder.my problem is how to delete the portion of the inlet and outlet cylinder inside the main cylinder.I did not see any merge option like in gambit.And how do you create a volume like you do in gambit.
next i have to insert a helical coil into this volume (through which fluid will flow ,which needs to be cooled by the air in the outer cylinder) how do i do these?
Please help,i am new to ICEM cfd.
i have attached some pictures for reference .