We really need to see a screen capture I think.
I suspect you can use the pathfinder to trim the shapes, but I'd rather see what you have to deal with before making a final judgement.
I can't show the actual document, but I made a fake one that (hopefully) illustrates the problem.
This is what it's like in Preview:
And this is the Normal view:
The original has more happening, but this is the general idea.
I can't make it in Photoshop and place as an Image, because other people have to change the "fox" image, depending on their department.
Thank you for the help! Sorry I am so clueless.
Probably the best thing would be to use the pen tool to add new nodes at the bleed lines (you do know you need bleed for this, right), and then just delete the nodes outside the bleed area. The patfhinder will work too. Add a frame on top of each part you want to remove, select the top frame and the tirangle, and use the "subtract" button (second from the left).
You can group all items (Object menu), cut the group via cmd/strg+X into your clipbord, draw a rectangle (or whatever form you want to have) and got to Edit >Paste into.
Willi, that was exactly the solution I need. Thank you!
Thank you also Peter. I'm sure this works perfectly, and will try again when I have more time. I think an InDesign 101 course is in order...
Thank you again all.