How to add/copy journal line description to all the additional lines created for Transaction codes d

 Hi everyone,

Here is situation:

-  I have a two lines journal and one journal line with a T-code and the line description field like 'Testing'.

-  During posting, system creates additional journal lines from the line with the T-code.

-  The description fields for all the additional lines are empty.

My question: how to copy or add the same description, such as 'Testing', to the description field for all those additional lines?

Thanks,

Ning