I don’t think he can. He’s not Scotty. Voyager tried to replicate the trick, and could only hold someone in there for a few hours.
Assuming it’s possible to copy patterns at all (maybe DS9 might know?). Barclay didn’t clone the mid-transport people. The person he grabbed would be the original. The pattern was just maintained for an unusually long time, like a natural version of what Scotty did in Relics.
I don’t think he can. He’s not Scotty. Voyager tried to replicate the trick, and could only hold someone in there for a few hours.
Assuming it’s possible to copy patterns at all (maybe DS9 might know?). Barclay didn’t clone the mid-transport people. The person he grabbed would be the original. The pattern was just maintained for an unusually long time, like a natural version of what Scotty did in Relics.