I have a problem, I have a field called productnr, and these productnr can be parts of kits and so many productnr can be part of different kits...how should I go about know?
Create a many to many relationships using 3 tables (two to store data - tblKit and tblPart, one to link the two main tables together-using the Primary key from tblKit and linking it to the Primary key for tblPart).
See this link below for a description of how to go about this for a car and car parts database: