form generated when choosing radio button using codeigniter

Hi everyone i want to asking how to make a form generated when i choose the option using checkbox or radio button. the form will appear when i choose the option button(manager) and if i choose the option(admin) the form will not appear. can someone give the sample code with javascript or can share the link so i can refer to. for example what i try to do is, i have a form which is user need to fill up

full name
address
user type(radio button)
admin
manager
when user choose as a manager the form will automatically appear and ask for fill more form like

location store
how many staff u have
store name
Thanks.