Impose a pressure

Hi,

I have a big problem ! Fisrt of all, i use two physics : laminar flow and heat transfer.
Then, my problem is about laminar flow physic. I put "0" values for v initial et p initial, i use inlet and outlet with pressure condition 250 bar pressure inlet and 0 outlet. Then i want to impose a pressure in the middle of my geometry to have 3 point of pressure but i don't know how ...

Someone can help ?

Thanks