I've been trying to figure out how to make it so certain items can only go to specific destinations. Initially I presumed that if I set an item to be filtered with a destination then it would only go to that destination, but this hasn't been working.

One way I've been able to do it was to create a rule for every place it can go and an inverted rule for every place it can't go. Is that the intended way?

It works but it seems really cumbersome and not very practical if you have a lot of items going to one of a few destinations.

In my use case I have a number of destinations and items coming from sources going to specific destinations.

Is there a better way of doing this?

As it stands for every single item I would need to make 8 rules in order to control where it goes and ensure that it only goes to one location.

Because I couldn't figure out how to properly do the filters I simplified the system. Can we please have a walk through on how to filter so that an item only goes to one destination and the like? the filters are pretty difficult to understand

This filtering system seems a bit counter intuitive at first, but it allows for very complicated routing setups. Unfortunately due to this, simple setups are a little more complicated.
To do a simple filter destination setup, I would recommend setting it to blacklist and use inverted filters.

How would you set up the black list and the inverted filters? If i want iron dust to only go to chest B of chests A, B, C

would i blacklist iron dust and then create an inverted rule saying iron dust goes to chest b?