Conditionals

Hi everybody.
What about conditional parameters like those in MS VOLT: context before, context after and except, where can I find these conditionals in opentype designer in FontCreator?

In FontCreator these are Chained Context Positioning and Chained Context Substitution lookups.

Thank you very much.
Would you please explain it in an example?

There are several topics here at the forum. For example:

Chained Context Positioning