Creo Parametric - Sketch Mode - Sketch References

This Creo Parametric tutorial video explains what Sketch References are and how to add them. This is part of the Sketch Mode Deep Dive series.
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Thanks,
Dave

[@ajlendresshauser1340]

is it possible to reference a new sketch to a previous sketch? I tried to make a previous sketch visible while I was in the process of making a new sketch but the previous sketch would still not show up.

[@MartinezRBA]

My creo doesn't snap into the references, how can I activate the automatic snap?