This function was added as an aid to imported documents as the title information is only ever split in to the U and D cells of the description.
To use this function:
Open Estimating,
Locate the first Item and amend the description to how you would like it.
From View window select Copy Buildup, From
Select all items the title is being copied to using Ctrl/shift or Ctrl/select
Press To Item(s) to complete the copy
Once finished select Cancel