[omprakash]

i dont xref plz explain

[FDArchitects]

xref is external reference in autocad. Xref is a drawing that is inserted in another drawing file for reference. The column schedule which has to be repeated on all floors can be xref-ed. The benefit is if u want to change any single column you just change in the column schedule drawing. It will automatically be changed in all the floors where it is referenced.

Don't hesitate to ask any other queries. You r always welcome.