New App created. Need Marketing for E-shots, comms. Does another marketing application / licence be required??

Question

Hi,

We have Dynamics Marketing.

A new area within our charity requires sending out e-shots to their contacts which will be business to consumer. Where currently our marketing team deal with business to business.

I've created a separate app, given permissions to some of the staff within our marketing team to access the app. to help assist with the marketing side.

The question is -

As this is a separate app from our Marketing one would we need another Marketing application and license or can I create a new 'customer' segment within the Marketing app??

Would i be able to keep the data separate, except for certain users??