How to automatic create link to related collection?

Hello. I am having trouble with automatically creating links between collections. I have a screen where I create budget items that are saved in my budget collection. I have regular fields such as name and amount. I also have a relationship to my scenario collection. The relationship is that one scenario can have multiple budget items.

For the action associated with the save budget item button, I am not able to automatically set the scenario associated with the budget item. I need the scenario to be set based on the value of the user’s selected scenario. Welcome ideas.

Hi @traverick welcome to the community. Could you share a screenshot of your current screen? How is the user selecting the scenario?