Configure multiple websites for intranet access

Transferred to work as an operation and maintenance development engineer.
The computer is equipped with dual network cards, and then there are different websites, which need to go to the intranet. Therefore, it is necessary to map various URLs that need to access the intranet into the routing.
The following figure shows the method of configuring dual network cards:

Then I want to add 15.XXX to the intranet, and add an instruction
route -p add 15.0.0.0 mask 255.0.0.0 142.160.114.254 (specific intranet address)
and then The URLs beginning with 10 and 15 are both on the intranet for data access