Create your blink morph on both eyes in your software of choice

Import as FBM or load morph target on head. I suggest as FBM because masters in the head are tricky with pmd.

Save your file after loading the morph.

Reopen the file you just saved. I won't bother explaining why, it's a peculiarity with the split morph command.

Click the white triangle next to your blink morph.

Select Split Morph command.

This will split the unified blink into blink_r and blink_l, leaving your original unified blink intact. 

At this point there are a couple of options. You now have a unified blink and a right and left blink. You could just leave it at that. I generally delete the unified blink, create new master called blink

Start Teaching

Set blink master to 1

Set blink right to 1

Set blink left to 1

Set master to 0

Set blink right to 0

Set blink left to 0

Stop Teaching.

Set tracking scale (dial sensitivity) and min max limits in dial setting for master and subs.

Done.

There's more specific notes about more elaborate conditions but that's the basics. Test your morph. Create a pmd inject. Test that. If the master controller does not work as expected through pmd I'll elaborate further. I've already gone over the specific case scenerios with you in the LH Genital thread.

You shouldn't be having a problem with this unless you are creating a master in the head and passing it via pmd. There's alternate methods such as spawning an empty as a controller. Let me know. I have off for the next couple of days and can illustrate copiously various scenerios if need be.