Metal canopy bars
Are you wanting ideas on how you can build a canopy frame from metal
bars? or, Are you wanting ideas on how you can make a canopy to fit existing canopy bars?
Posting a picture of the bed would help illustrate the situation.
Shelly: maybe this will help
Check out this blog post: https://www.instructables.com/id/DIY-PVC-Pipe-Bed-Canopy/