I'm a little confused here. Are you saying that you, essentially, have an 'opening' that you want to 'frame out' and cover with siding??? Or, are you wanting to simply repair 1 'sheet' of damaged vinyl?
If it's the former, good luck finding the exact siding to install in the opening. Assuming you can, see this past Follow-up: How To. If it's the latter, go here: Repairing Vinyl Siding.