How to organize access to the Internet for users of the central office through the routers of the branches?

Question

Mikrotik

The crux of the matter is the central office and branches, they all connect to an intermediate router. The network diagram is as follows: How can I make PC1 access the Internet through out-1, PC2 through out-2 b PC3 through out-3? PC1, PC2, PC3 are in the same address space. RouterOS is used as routing, where in the physical version where in the virtual one.

Answer 1

https://wiki.mikrotik.com/wiki/Policy_Base_Routing

Answer 2

Drive everything into one L2 domain using eoip tunnels, and accordingly for PC1 specify the gateway out-1, for PC2 - out2 and for PC3 - out3