same data in 2 tables

[Brutal]

Hi
This will be an easy one.

I have 2 tables one called production and another called associated
When I created this database 2 years ago I managed to reference a column from production to Associated i.e a field called kit number that was in production also showed the same data in associated. I havent touched Access since then have forgotten everything, I would now like to reference a field called completed date from production in to associated,

Any help gratfullly recieved.

Thanks

Bruta