How to redirect all traffic from one VPN Mikrotik client to another?

Question

VPN

There is a CHR cloud router, clients cling to it, you need client A to go online through client B.
CHR
11.11.11.11 Main IP
10.10.100.0/24 its network
PPTP and L2TP
tunnels 172.16.10.0/24
Client A 172.16.10.11
Client B 172.16.10.12
On the client side In Kinetic, where it is allowed to access the Internet through a client connection.
Help set up routing or marking. Thank you.

Answer 1

You need to register routes on all three participants in the exchange.
What networks are behind clients A and B?