Using the Get Proposal Function 

From the short text editor, choose Proposal pool ® Get proposal, and then select one of the following options:

If you choose This line, the system will only fetch an existing proposal from the proposal pool for the current line.

If you choose All blank lines, the system will fetch existing proposals for all blank lines, in other words, text lines that do not contain a translation as yet..

If the best proposal is longer than the space available, you are prompted to create an appropriate Length variant.