Thank you for your email.Please find below our advice on your inquires.Question 1: If the said voluntary amendment in step 3 were not submitted, could the protected scope of A mode design cover C mode?Because the basic features of A mode design and C mode design are the same and only the non-basic feature (the added small part) is different, in theory the scope of protection of A mode design also covers C mode design. However, in case the design is infringed, the above addition of C mode design to the application will give the advantages that we can simplify the process of proving the infringement.For example, if only A mode design is registered and C mode design is infringed, the Applicant have to prove that (by submitting documents and reasons) the registered design A and the infringing product with C mode design have the same basic features. In this case, the infringer would certainly do his best to argue back, and the final outcome is unpredictable. The whole process may take a lot of time and effort.If both the A mode design and C mode design are registered and C mode design is infringed, the above process will be much simpler as the infringing design is the same as the registered one.Question 2: If the said voluntary amendment in step 4 were not submitted, could the protected scope of B mode design cover D mode?Please refer to our advice above because this case is similar to the situation of A mode design and C mode design. Overall, given that the client wants to make sure all 04 modes of the design are protected, we suggest that the Applicant should amend the applications to add the C and D modes of the design. In case you need any further assistance, please do not hesitate to contact us.We thank you for your cooperation and look forward to receiving your further instructions soon.Best regards,