From Yesvantpur TTMC only 401 goes to Yalahanka direct but long route.
So start early if you want to travel by local Bus.
Lots of Buses from CBi Ganganagar/Hebbal to Center you want to go 402D, 356J, 365M, 402, 402A, 402B, 402C, 402M, 284D. Most of buses comes from Majestic the main local Bus stand or KR Market.
You can take Auto to CBI/Hebbal...
more... or just use Uber cab. In return you can explore Bus.