Hi Sanjhosh,
Lindsey may have a better answer, but if you just need to manually remove a single capsule from the condition, what I would do is create a custom condition, call it the subtraction condition, selecting only the capsule you don't want included in your final condition. Then I would use a composite condition with the 'a minus b' option to return capsules from your original condition minus the capsules in your subtraction condition.
For example, if I had the below and wanted to remove the circled capsule:
I would click on that capsule then open the custom condition tool:
Then create the composite condition with that capsule removed: