How can i get Data from List in Root Site

[p_leibling]

Hello, in Sharepoint Online i have a Site Company, in this Site is an List Customers and a Subsite Tickets. Now i want to create a List Ticketlist and want to use the Customersnames from the Customerlist in the root Site.

Is this possible? And if yes, how it works?

Thanks a lot for your help.

[#2]

First question i want to ask is why do you still use subsites?
Second i think this will not work.

[#3]

@paul keijzers :

Hi Paul, thnks for your fast reply. I want to separate specific areas (Ticketssystem, Domainmanagement, Informationmanagement and so far) with specific rights.