Customer records will be synched from Sage X3 to Dynamics 365.
Sage X3
Navigation path to add Customer in Sage X3: All > Common Data > BP tables > Customers.
Click on + button and fill details of the customer and Click on tick button.
GUMU™ Cloud Portal
Sage X3 Customer
Dynamics CRM
Synced data will display in Dynamics > Account as shown in the below screenshot:
Navigation> Dynamics CRM >Click on account >Click on customer