I have a requirement where I need to have Rich text with a floating field that linked to a particular item of repeating element. For example, I have multiple client/applicant names in a repeating block but want to generate a letter out to a primary applicant with his/her information. I know the index of the primary applicant from those repeating elements. I would like to create a rich text blob with information of a client that matches the index.
Rather than using the linked field reference, you can put a calculation on the floating field. If the target field is inside a repeat and the floating field is not then it is simply a case of adding a dependency to the desired field and the default dependency type is a value array which you can then return the specified index.