re-routing vent line

Sorry about the diagram, let me try it again.

Sorry about the diagram, lety me try again.

Presently

I______vent_______III I IIII I III waste I III stack I III Osink I

Can I do this?

I_____vent___I III I I III I I III waste I I III stack I I_____III Osink I

I previously posted on cutting a cast iron pipe to tie in a vent line, but I might have an alternative to avoid doing this, so here is my dilemma. In my kitchen soffit runs a vent line horizontally (parallel to the soffit) that picks up the 2 bathrooms on the upper level of my split level house. This vent line ties into the main waste stack in the soffit. I would like to eliminate the soffit, which means re-routing the vent line. Can I route the vent line up to the attic between the wall studs, go horizontal, then back down again between the wall studs to tie into the main stack?

It's still as clear as mud :-)

Does the waste/soil stack extend thru the roof?

Where are the bath fixture connections in relation to everything else?

Could you create a line diagram in Paint or similar and upload a .jpg to PhotoBucket or similar?

Jim

Sorry about the confusing multple posts. When I originally posted this message with a line diagram, it did not come out right , so I deleted the message. But to answer your question, there is nothing else connected to the stack upward, it just goes through the roof. The bath fixtures are on the second floor. Those are the highest drains in the house. I'll try to post an image later.