Can I use a 220v 60 amp breaker and 4/3 line for a sub panely with 2 breakers 220 1 35 amp and 1 15 amp
As long as you have the clear space, go for it
You should have no problem installing a small NEMA 3R &quot;spa box&quot;-sized subpanel in place of the existing disconnect and running your flex whips directly from it.  Just make sure that you have the NEC 110.26(A) required clear working area (30&quot; wide, 36&quot; deep) at the disconnect location before you start, as HVAC installers don't always remember that when fitting local disconnects.  Also, you'll need to make sure the panel has a grounding bar fitted and remove the bonding screw from the neutral bar on the panel.