Problem:
Check box fields not staying checked when child posts are set
Solution:
We just published the new release for Types v3.0.2, Views v2.6.2 and Forms 2.0.1. Could you please update ALL Toolset plugins (Toolset plugins you are currently using) to it's latest official released version and try to resolve your issue.
Problem: I would like to move an existing custom field that is already saved in several posts, into a Repeating Field Group (RFG) applied to the same post type.
Solution: Migrating existing field values would require complex custom code. Dragging the field in the field editor screen would not delete any data from the database, but it would not migrate the values correctly either.
The issue here is that the user wanted to share a custom field value among multiple posts.
Solution:
Unfortunately no this isn't possible because each custom field is a separate instance in each posts and each requires its own value as they are uniquely identified to a specific post in the database.
So you will need to manually copy the value if you want it to appear in another post.