3 level cascade combo box

[cliffschooling]

I'm trying to create a database in Access 2010 to record causes of downtime and need a 3 level combo box to do this. I've very little knowledge of VB, but have got as far as getting the 2nd level to work but the 3rd is prooving a real pain. I suspect there may have been some muppetry on my part and I'm missing a trick here. I'd be grateful if someone couple give the database a quick squint and point me in the right direction.
Cheers
Cliff

 

[John Big Booty]

Posted in wrong category (Introduce Yourself) and moved to the correct category (Forms).

 

[cliffschooling]

Posted in wrong category (Introduce Yourself) and moved to the correct category (Forms).

OOOps sorry about that, new to this malarky