SAP Engineering Control Center
If you connect external CAD systems to the SAP system, you have the option of exchanging the data directly from the CAD system with the SAP system, or you are working with an alternative interface in the form of the Engineering Control Center.
However, this Engineering Control Center is increasingly also used "Stand Alone", that is, without the CAD integration of customers.
Take a look at the options offered by ECTR.
SAP Engineering Control Center: Overview

The SAP Engineering Control Center (ECTR) is a user interface for CAD integration, which allows you to edit document structures, either in the CAD system, or in the SAP ERP system.
The SAP Engineering Control Center lets you manage all engineering data of the CAD system: those with access to CAD data can use version management and status management. This means that multiple users can work simultaneously. Inconsistent data is avoided with the check-in mechanisms. You can load workstation applications for displaying and editing from the SAP ERP system into the CAD application directly.
The following video illustrates the concept.

The scenario could be started using the private folder in your SAP Engineering Control Center scenario, If necessary, it is possible to identify the document structure at this point.
The document info record will be created automatically depending on the predefinitions you made. The document type, the status, and the short text have to be defined, as well as the relevant workstation application. By doing this, the creation of the document structure runs automatically. If everything is done, you could transfer the structure from your private folder to the public one.
ECTR Desktop

In the control center, you are able to:
Change statuses
Delete documents
Create versions of originals, release, and edit
Create and link material masters
Create, change and explode material BOMs
Do mass changes
SAP Engineering Control Center: DIR Detail Information
CAD Integration
If you connect external CAD systems to the SAP system, you have the option of exchanging the data directly from the CAD system with the SAP system, or you are working with an alternative interface in the form of the Engineering Control Center.
Let’s look at what an integration from an Autodesk Inventor might look like.
The first screen now shows the ECTR integration within the Inventor interface.
By means of the interface connection, entries are made in the CAD application for the corresponding SAP functions. These include the normal log on and log off functions, the SAP Engineering Control Center settings, and also simply displaying or changing documents.
CAD Data transfer
The next video shows a possible data transfer, starting with the creation of the data in the CAD system, the creation of the document info records in the SAP system, and the linkage of the files, up to now to the creation of the materials and the derived material BOM.