Delete a value from a field in subtask automation

[Raimi MÖLLER]

I have a custom field where users can select certain values with a checkbox.
Based on these values certain tasks get made in my automation flow.
But certain subtask should take all but 1 values selected

So the user selects A-B-C

If(B or C)
Subtask 1 gets made with value BC (how do I remove A here)

If(A)
Subtask 2 gets made with value A (this is just via the filter and 1 value assigned)

But if the user selects AC

If(B or C)
Subtask 1 should get made with value C (how do I remove A here)

If(A)
Subtask 2 gets made with value A (this is just via the filter and 1 value assigned)

[Bill Sheboy]

Hi @Raimi MÖLLER -- Welcome to the Atlassian Community!

What have you tried thus far to solve this need?

If you have a rule that is not working as expected, please post the following to provide more context:

• what type of project is this (e.g., company-managed, team-managed, etc.), 
• what type of field are you trying to change / remove the values from,
• an image of your complete automation rule in a single image for continuity,
• images of any relevant actions / conditions / branches,
• an image of the audit log details showing the rule execution, and
• explain what is not working as expected and why you believe that to be the case.

If you have not yet started a rule, I encourage you to try.  Successfully using automation rules requires learning and experimentation.

To help you get started, your rule could use conditions to detect what you describe and then replace the field values completely, using your A, B, C values, as needed.

Kind regards,
Bill