As per your suggestion we need to follow the below steps to accomplish to achieve your requirement.
- Export the first 1k records from grid to excel and save the document.
- Export the next consecutive 1k records from grid to Excel and save the document.
- Repeat the above steps till 65 k.
In this process, you can save as multiple documents not as single document. Are you satisfied with the above mentioned details to do your requirement ? please get back to us if you need further assistance on this.
Note: At present , we don’t have support for merging multiple document into single document.