https://www.cartmega.com/el-gr/topiclists-for-osticket-el-gr.html
Topiclists for osTicket (Ajax Help Topic Custom Lists)
Topiclists for osTicket - Topiclists is a plugin that allows for smart, dynamic, interlinked and nested ajax custom lists on the ticket creation page.....
help topicosticketajaxcustomlists