How to use Class Kerning with OT Ligatures?

[Mikedesignerd]

How/Can you use class kerning for custom ligatures?

Example: I have a custom "th" ligature, after creating the class I go to metrics window to make the adjustments.
Once in the metrics window I type "t" "h", and that's all I get "t" "h" separately not my "th" ligature. How do I get the "th" glyph to show up in the metrics palette so that I can kern it?

Thanks in advance.
A lot of valuable information so far.

I had posted this earlier in the wrong forum. my apologizes. total newb.

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