Get customer vehicle data into Sales Order fields

When we create Sales Order/Invoice we need to add customer name. & what i want “v_vin” data in Customer Vehicle field which is related to the above enter customer name, Can you please help me ?

let me make it more easy. “Customer with vehicle data”

Now. Check this two screenshot

In customer vehicle field there should be only 1 vehicle data because “Ghislain Gervais” only represent only 1 vehicles.

Thank you so much, Can anyone please help me.

Try this according to document