You don't have a problem.
You power supply is 12V and is capable of outputting any amount of current from 0 to 200mA. Note I said zero.
I think you have a amplifier that needs 5mA and another amp that needs 5mA and a load cell that needs some thing from 4 to 20mA. All that adds up to less than 200mA.
You power supply will try to make 12V. As far as current goes, It is very happy at 0mA, 10mA, 20mA......200mA. It probably will not be happy above 200mA.
It is too common for people to think the power supply will force 200mA down the wire. It won't. It will force 12V on the wire.
Just to give an example. Your car had a battery in it. On the side of the battery it says "12 volt, 650 cold cranking amps". The battery is capable of starting you car at 600A. But if you only have the radio on the battery is delivering only 2 amps. And with no key in the car it is doing 0 amps.