Hello Jacob
1. when you want to service equipments which are not sold by your company. Do you have any details of those equipments . because you can service the equipments but those equipments should exist in your system. can you explain your scenario in more details here
you can create an Ibase as soon as equipment comes for servicing . But before that you should identify that its your equipment.
yes you cna replicate the equipment to ECC after creation in CRM. Cost center is assigned to service org by standard.
Regards
Naresh