I tried to understand your question using Google Translator, and I believe you are wondering if your modification in CAD will be reflected in the Multibody model that has aleady be created. Let me know if I misunderstood your question
The quick answer is unfortunately no. Everytime a change is made in CAD assembly, you will need to run the conversion workflow again to generate a new Multibody model to reflect the changes.
If the change is small, however, it may be possible to update the Multibody model manually. For example, if you just changed the geometry of a part, while all coordinate definitions and joint positions remain the same, you may export the part as a STEP file and then in Multibody make the corresponding File Solid block point to the new STEP file. This can be beneficial after you have made substantial modification of the Multibody model, for example adding actuations.
Hope this helps.