Individual block in stacks

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One much appreciated new feature of C5 5.6.x is that "You can now choose an individual block or an entire stack when adding a stack on the front-end."

Can anyone explain how to choose an individual block from a stack in code?

Many thanks in advance.

mnakalay
 
mnakalay replied on at Permalink Reply
mnakalay
bump...
Nobody really?
mnakalay replied on at Permalink Reply
mnakalay
bump again, just in case :/