@jayjay this can be done but you would have to configure a number of things to enable it. Firstly you would have to build a new relationship between Control objective and Engagement tables. You would then have to build a business rule/flow that whenever a relationship is made between the two look up the related entities for the control objective and then create a relationship between them and the engagement. You may also want to set up a rule to do the opposite but when a control objective is delinked but it can become quite complicated. Finally, you would then want to make a choice of whether you want to prevent controls being linked. OOTB when you relate an Entity it relates all the controls to engagement. You could build a UI button to delink the controls which arent related to the linked control objectives or deactivate the OOTB rule that generates the control relationships and make your own instead.
While this can be technical achieve, you should consider the effort to maintain this in your decision of whether you want to configure these rules.
