Hello, this feature would allow better manipulation of currently existing records within a collection, as well as a wider range of customization for each user (for example, adding or removing unique records from a watchlist or a favorites list). The ‘Update Record’ action cannot target specific values within an existing collection set.
This action could be triggered via a workflow or using an action button.
Thanks!
Hey @Amt718 - welcome to the community! 
Would you mind expanding on your post a bit, usually it helps with an example of what you’re actually trying to do.
The example’s you have used, like adding a record to a watchlist or a favorites list are definitely doable at the moment with the “Update a record” action
Hi, sure! Lets say my Users Table has a column with linked records in a Clients Table. Many users can select many clients, and many clients can be selected by many users (favorite clients, pinned clients, etc). But lets say I want to remove a client from my selected clients without it causing the client being removed for other users and without having to empty all the clients in my collection. I don’t believe this is currently possible.
Additionally, if I wanted to add new clients to the existing collection the ‘update a record’ action replaces the entire collection with the record taking its place instead of adding to the collection.
You can absolutely do this!
In fact, you use the same action that you use to add your clients to the favorite.
Noloco’s “update” on many-to-many fields (as you’ve described) works as a toggle.
So if you update the favorites field with a client, it will add it to the favorites.
If you update the favorites field again with that same client, it will remove it from the user’s favorites.
Does that make sense @Amt718 ?
AHA!! Ok, wonderful. That works perfectly. Thank you for the suggestion!
Happy to help! Thanks for the good question