Add a number to a field based of the number of occurences of specific text in another field

Multi tool use


Add a number to a field based of the number of occurences of specific text in another field
I have a field that has several selections for trainings that can be input into my access database. I have an index set to not allow duplicates where the training title and date match, but there is one generic training that I'd like to allow to have duplicates. I'm thinking that if I can create another column with something like an auto number to the index then that might solve my problem. However I don't know how to do that.
What I'm thinking is that each time the training "Additional Training" is selected, this other column will detect that and add an auto number (or other unique identifier). It will not do this for any other entries, thereby allowing only that one training to be duplicated.
Any suggestions?
By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.