I have the following scenario and I am not so sure if/how it can be achievable
I have a product test form which has many field. Among those field, is a certificate field, which holds a certificate when the product test is completed. However, as the product test is a constant process set by intervals, I will need the certificate field to be updated with the new certificate number without overwriting the previous one. In saying that though, I won't be able to have them in the same field as it will become too large as many will be carried out on the one product, so what I'd require some sort of linkage to all previous certificate id's for a specific product.
Any ideas will be appreciated.