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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.
Use the EllisLab Playa & Matrix Importer
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