Edit header and line level data in VBCS

Summary:

I have headers and lines for a entity.. I have created editable table on headers data to make updates. now I want to update line of header as well based on some condition. What's the best way to update lines (I learnt that editable table (for lines) inside another editable (header) is not possible.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):