Hi there @Dimitar Petkov,

Welcome to the Community.

You can create a segment of customers who have placed an order ​between specific dates. For example:
​
Then you could tag the segment for whichever audience.

I highly recommend checking our additional resources found in the help center and Academy for segment guides. Thank you!

Alex

hi, but how do you know, that these orders had made by NEW CUSTOMERS?

Hi @Xavi great question, thanks for continuing the conversation!

You can segment by NEW CUSTOMERS by creating a segment by What someone has done / placed order equals 1  over all time 

AND

placed order at least once between x dates (if you are looking at new customers for a specific time frame). Adding the parameter that they have only placed one order over all time would mean they could only be new customers. 

Hope this helps,

Katherine