Break down Pop up menu value list

Hi

please can someone help me solve my issue

I created a manufacturing solution that to every product one can select its ingredients from a pop up menu in a portal.

the portal then take you to the related ingredient page where it has additional info about the ingredient

my issue is when i created it there were only a few products so wasn`t such an issue scrolling down the list to select the relevant ingredients, but as the solution expanded and more products were added the ingredients list became very large and one has to scroll through several 100 of ingredients to select the one he is looking for.

i would like to break up my pop up menu , ie one should first select with what alphbet the ingredients starts with and his list is then shorter and easier to manage.'

please can someone help me how to do this or if someone has any other idea how i can make the solution easier to use.

I would appreciate someones help, thanks in advance.