Modules and Views → Projects → User Actions → Copy Dimension
The Copy Dimension dialog box helps you copy dimensioned attribute values from one dimension to the other. You can elect to copy all the data or copy only the data that falls within the specified date range. When data is copied data into a dimension, all data in that dimension is overwritten; if data is copied from within a specified date range, only the data in that date range is overwritten. Copying a dimension does not affect the task plan data. (You cannot copy data to the Plan or Actual dimensions.)
Use the Copy Dimension dialog box to copy data from one dimension to another.