Different out points

Hello, i'm new to Fusion and i'm trying desperately to transition from AE so maybe this is a no brainer.
I'm in the midst of a project where i have to key out a LOT of footage and put it in a CG environment.
I have so far keyed everything and i'm having a bit of a problem.
The footage files vary in length from say 80 frames to 480 frames. I have rendered a CG background in Cinema 4D that is 500 frames long. I comp it all together and connect a saver to save out the individually comped files but every file is now 500 frames long since it's the length of the background.
I should also say that the background is a node tree where i have connected an autodomain node and a wireless node to be able to place it in each key.
Is there a way to 'crop' the length of a clip before or perhaps in the saver?
I'm in the midst of a project where i have to key out a LOT of footage and put it in a CG environment.
I have so far keyed everything and i'm having a bit of a problem.
The footage files vary in length from say 80 frames to 480 frames. I have rendered a CG background in Cinema 4D that is 500 frames long. I comp it all together and connect a saver to save out the individually comped files but every file is now 500 frames long since it's the length of the background.
I should also say that the background is a node tree where i have connected an autodomain node and a wireless node to be able to place it in each key.
Is there a way to 'crop' the length of a clip before or perhaps in the saver?