When you are creating a new campaign and get to the prospects stage, if you wish to assign prospects who are already there in your system.

Step 1: Click on actions --> assign more  

Step 2: Select from the list of prospects that you wish to assign to the current campaign and click on Assign.

Note:  You could see only the prospects who haven’t been assigned to any other campaigns (since a prospect can be in only one campaign at a time)

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