How Do You Pass In Multiselect Parameters Into a Stored Procedure?

How Do You Pass In Multi-select parameters into a Stored Procedure?  

I need the results to be in a @LOB_KEY

the code:

		HAVING 	CLAIM_LAST_STATUS IN (@CLAIM_STATUS) 
			AND LOB_KEY IN (@LOB_KEY) 
			AND POLICY_YR IN (@POLICY_YR)

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The @LOB_KEY needs to be passed in and partitioned into multiple values:
HAVING IN (value1, value2 etc..) CLAUSE

Any advice on a solution is appreciated.

Dan