Yes, you can submit the DSC Registration/E-Sign letter and EPFO Form 5A together. However, it's important to ensure that both documents are filled out correctly and completely.
For the DSC Registration/E-Sign letter, you need to provide all the necessary details, including your name, address, and the type of digital signature certificate you are applying for.
For the EPFO Form 5A, you need to provide details about your establishment, such as the name, address, and the code number of your establishment under the EPF & MP Act, 1952. You also need to provide details about the ownership, management, and control of your establishment.
Once you have filled out both forms, you can submit them to the appropriate authority. In your case, since you are located in Karur, India, you should submit these forms to the regional EPFO office.
Remember, it's important to keep copies of all submitted documents for your records. If you have any further questions or need assistance with this process, don't hesitate to ask.