Yes You can change without loosing data. Go to this link replace *test *your content type name and *field_test *with your field name. admin/structure/types/manage/test/fields/field_test/widget-type/

On Fri, Jan 11, 2013 at 6:17 AM, Jim Ruby jim@v-community.com wrote:

I had created a content type with a taxanomy term as select list. Well now I would like to change this to check boxes, is there a way to do this with out loosing all the data?

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