IPSEC to Sonicwall

Ok so i have my peer all set up. But I can’t figure out how to make traffic to route to it. For example:

10.20.10.0/24 is my local lan
10.20.15.0/24 is my ip set interface to the ipsec vpn

I’m trying to route the folllowing:

remote local laptop
172.16.0.0/16 ↔ 10.20.15.1 → me
10.120.0.0/16 ↔ 10.20.15.1 → me

I can’t figure out how to router traffic on my 10.20.10.0/24 network thats destinted for 172.16 and 10.120 to 10.20.15.1 then out over my vpn tunnel. Help please