Is there any way to convert a Matrix field to a Grid field for existing entries without losing any data?
There is no easy way,
you must write a custom code to get the data from matrix field and add them to grid field
some PHP and MySql code.
I can do this for you if you want, but we need to contact in privet to get more info about your site.
Thanks for your response and for your offer. I appreciate it. I think I'll just leave it for now. Mar 14, 2014 at 20:11
Use the EllisLab Playa & Matrix Importer