2 Sidebar menu items and 1 Tab in shinydashboard

shiny
1

I have 2 sidebar menu items 'A' and 'B'. I have only one tab 't'. I need to change the content in the tab based on sidebar menu item selection without changing the tab.

menuSubItem('LTE',
tabName = "t",
icon = icon("dashboard")),
menuSubItem('UMTS',
tabName = "t",
icon = icon("dashboard"))