Hi Stacy - What you do is choose the first deployment timezone. Let's say for example that we start in EMEA. If you plan on doing these tiered global deployments where everyone gets the email at 10am, regardless of where they are located. I'd setup a few smart lists to segement region. Or speaking of segments, you could use one as well.
Then you can say, if users are member of smart list, timezone EMEA, then they get sent this email. Then wait 6 hours. Then if member of smartlist, Eastern timezone USA, then send the email. Then wait 3 hours, if member of smart list Western timezone USA, then send the email. And finally, wait 9 hours, and then send to APAC.
Does that make sense?
Flow steps...
If XXX send email
Then wait X time
If XXX send email
Then wait X time
If XXX send email
Then wait X time
If XXX send email