Use subforms for multiple entry

Use subforms for multiple entry

I want to add the production tools of our customers to a database. So a database with machines linked to an account in Zoho CRM.

I have one form (MachineEntry) where you can describe all the specifics of a machine (name/type/year). From another form (MultipleEntry) I want to add multiple machines at once by using MachineEntry as a subform. 

Both MachineEntry and MultipleEntry contain a ZohoCRM lookup. 

When you add a line from MultipleEntry in the MachineEntry subform, it automatically fills the ZohoCRM field in the MachineEntry form from the MultipleEntry form.

Is this a good way to work? Or is there a better way to add multiple machines to one customer at once?