Thank you Aussie, I will try the import.
Rob, about two month ago I thought it was the 32-bit system issue, but now we have a 64-bit PC and the problem persist. I don't know if PDF will be a good choice, I never try it so let see. We import all plt files from consultants into the lbk with the viewsets from AC. This project have 285 sheets, maybe that's the problem