Customer data can be created directly when creating a new order. 

Create Quote / Customer / Create Organization

or directly in the menu item "Organizations" then "New organization".
Here you can also make more extensive settings like e.g:

(Invoice)-addresses are entered directly in the order. Delivery address in Shipment. (i.e. when creating the shipment)

Keyline remembers all addresses and suggests them for a new order. Using the quick search, an address can be selected from the organization's address pool.

If you want to delete or change addresses, you can do this directly in the address management under Sales / Organization / Selected customer / Addresses