Convert an imported chart (picture) to an editable drawing object

[fishguy]

I imported several charts from JMP to word 2010 document. By accident, I converted one of the charts to a drawing object and all elements in the chart became editable. I would like to convert the rest of the objects but I have no idea how I converted the first one. I copied and pasted the chart as an object from JMP software so normally it considers it a basic object and cannot be edited as a picture or a drawing object. I have tried searching multiple ways to get the answer but so far have struck out. Thanks!