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Drawing

Is it ok to start a vent on a 45 from a wye like on this drawing?

I need to clear the edge of the sink (actually a giant double compartment sink) before I can go up and start horizontal once I clear the flood rim + 6".

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    Technically you have an S trap there. That's not allowed by code, but if the vertical above the wye is short enough it won't make any practical difference. I'd reconfigure to not have any drop before the split for the vent. It looks like you have room to do it there. – isherwood May 20 '18 at 2:44
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Absolutely! Most any fitting is perfectly acceptable and legal, just don't use any reducers, caps or traps in the venting.

Though, check with your local Codes, Building, Zoning, Permit or Inspection Department (whatever they're called around you). That 6-inches above the Flood Rim may need to be 36-inches and if there's a toilet on the line a 2" vent pipe may be required. Same goes for bird screening or goose-necking of the exterior pipe termination.

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