Question
QUESTION: does a butterfly bush send off leaders and come up all around it
ANSWER: Yes they do sprout from the root system to form new plants. This is one way they spread.

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QUESTION: can you dig these up and transplant them to a diiiferent location they have realy long roots. will it harm them are the main plant Thanks

Answer
Yes and now is the time to do this. I would start digging around the drip line to loosen some of the roots about a week or two before you transplant, wait about a week & loosen some more, and dig the root ball. Replant in a hole about twice the size of the root ball and fill with good potting soil. Water about an inch every day for at least a week, then go to weekly waterings or as needed depending on the rains you get.