Problem with Ref

[MicOxa]

Hello. This is my first app with AppSheep.

I am looking for a solution to my problem.

I have two tables:
1 Suppliers
2 Certifications

In the first table I have the CERTIFICATION column where I set a ref. Which takes the values ​​from the Certifications table.

How can I select multiple items from the drop-down list?

Thanks in advance.

PS. I’m sorry, I’m still not very practical