Move content from field to field collection
You can do it with 3 step


In your content type, creat new field collection
Write one module, use function hook_node_presave(). In this function, you can copy data from old fields to new field collections.
Go to page admin/content. Select your content type. Select all node. In tab UPDATE OPTIONS chose Publish selected content and submit. This action to do run code your module write in step 2.