There aren't any other tutorials other than the ones you can search and find in the tutorials section.
You could either name the dropdown lists with an incrementing number and then use that to search, or you could name all of the lists the same name with brackets at the end like "option[]" and then the options would be submitted as an array you could loop through.
This is going to take some hand coding, so if you aren't able to do that I'd suggest using premier support or using Powerstore as a starting point since it already has this feature.