I have a lookup relationship between Object A and Object B . “A” is the parent to “B”.

When a record from “A” gets deleted, the related field value in record “B” is removed. What I want do is remove the field value of a different lookup field value on “B” once the field value between “A” and “B” is deleted.

When a field value is removed on the child, due to the parent record being deleted does this count as an update to the record? If so, I believe it should be possible to update this through visual workflow, process builder or workflow rules, but have not been able to get this to work.

I have also tried using a formula field checkbox. When checkbox = TRUE on record B, run the workflow rule, visual flow, or process builder, but have been unsuccessful.

Is this possible through visual workflows, process builder, or workflow rules?