The company I work for is a 3rd party manufacturing company. We currently don't have Engineering, Service dept.....all we currently have is procurement, production line and a CFO. For sections of ISO that talk about Engineering how will we fulfill those during an audit.
Organizations are allowed to exclude any clause from ISO 9001:2015 if such clause is not applicable for the organization. In your case, you can exclude clause 8.3 Design and development and you should consider excluding clause 8.5.3 Property belonging to customers or external providers.
For every clause you exclude form your Quality Management System, you must provide justification, in your example, it can be a simple statement that you exclude clause 8.3 because you do not perform design and development as a process in your company.