CRED plugin allows you to build forms that create child posts and set parents for these posts, supporting the parent-child relationship functionality from Types plugin.
When you ask for help or report issues, make sure to tell us the structure of your content and the relationship between the content types.
Problem:
The customer asked how to create a post-relationship when a form to create a new post is submitted.
Solution:
Guided that this will require a custom function, attached to the "cred_save_data" hook, and will use the "toolset_connect_posts" function to connect the two posts.