Task Assignment and send email to multiple users

I have a group of merchandise provider users that have to be selected before moving forward to the next step in my process. After I selected the desired providers users and submit a quote request, the process should send an email and assign a task (create new quote form) to be completed by N number of merchandise provider users. How should I setup my process model nodes in order to send email notifications to this selected providers and assign tasks to be done in a sub-proccess to create new quotes?

This is how my process model looks like:

Please help.

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