I was just about to offer Shane's solution. :)

I have a question, though, because I haven't actually tried it. If there is no separate group (say you're working on just part of the shin) showing in the morph tools, will creating a new group with the grouping tool for the part you want to morph work too? (WIll a new geometry grouping show up in the list when you're using the morph tool?) I suppose I could test it pretty easily, but if someone just knows offhand....

And it's as well to know what Timberwolf is talking about in case you screw up and morph the wrong group anyway. :) You can also rename the morph to something other than "custom morph" before you make the first adjustments with the morph tool.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.