Regarding giving input to Prismatic joint in Simmechanics

Hello, I have a manipulator as shown in the figure attached

The three prismatic joints can be actuated to get different position and orientation of the top triangle. I know the length of the prismatic joints which is a function of time, i.e., at t=9am, l1=1.2m, l2=1.5m, l3=1.9m. And like this, the length varies every 5 min till 4pm. I have made a SimMechanics model also

Is it possible to give an actuation to the prismatic joints like the one I have mentioned above. If yes, Pls let me know how?

Thanks in advance

[iqram roslan]

can u please email to me your simmechanic block diagram. i am doing the same project like u and i dont know how to build it. my email [e-mail]