Getting integer values from different blueprints

Sorry if my explanation is poor.
I have set up four different blueprints each requires the player to do an input after that they add integer value to a variable. I need to get integer values from all those blueprints to another blueprint which when integer values add up to an equal number it will open a door.

what kind of blueprint are those four? Actor? is placed somehow on the map? if is that the case, you can use the node ‘Get all actors of class’ to get a reference to that blueprint.

They’re box trigger blueprints, I have to bring four objects to each trigger, and each object adds an int value, so when each of the trigger blueprints has those four objects a door (level sequence) opens, which is the blueprint I want the int value to go to

You can create a function that get all the box trigger reference, then get the variable you want from the box trigger, compare to the desired value, so after that you open the door if all the variables meet the condition.