Open issue #1 with details in the right hand column.
Type text in the "short description" (see attached screen shot of issue #1)
Click into issue #2 with same detail window on the right hand side.
click into short description as if you were going to add text (see attached screen shot of issue #2)
the text you typed in issue #1 will appear in issue #2. I have a video but it has confidential info.
@Tanguy Crusson