[Paul F]

'Slinger is right. Let's see a picture and we need to know what kind of metal and what kind of cut is required. Aluminum gums up a lot of tools. We also need to know what tools you have so we can suggest what to use or buy.

If it is steel, the lowest budget solution if you don't have any tools is an angle grinder with cutoff wheel. $15-$20 at Harbor Freight. Aluminum will gum up the angle grinder, but it might work depending upon cut.