drop down list

[Sarra Belkadhi]

Hello, I have a list of group leaders and each group leader has his own team, when a group leader clicks on his name,it leads himto his employees, I wanna make a drop down list so he can select the employee he wants but i dont want the drop down list to show all the employees from all the teams, i only want it to show the employees of that particular group leader.

there is no data limiting possible so i wonder how it is possible to do it, or if it is even possible.

 

Thank you in advance.