Lump sum pension distribution with an RMD

I would like to roll over my lump sum pension distribution into an IRA, but have an RMD due as I turned 72 in Nov. of last year.  Can I roll over a partial distribution that is less the amount of the RMD?  Or do I have to cash-out the entire amount because I cannot roll over the RMD portion?  

 

Thank you for any assistance.