I got the last weeks a few times the question: “How do I post my message in several LinkedIn Groups without having to copy/paste it?”
It is not very intuitive, but rather simple.
These are the steps:
1) Post your message in one LinkedIn Group.
2) In that same Group, click on “Search”.
3) Below your message you will see the option “share” (caution: this only works in the standard view, which equals “All Discussions” on the left hand side).
4) Click on “share” and choose the other Groups you are member of in which you want to post the message as well.
To your success !