Web server Creating tags

Dear all,
I am currently working on Web server application on Arduino UNo .I wanted to create tag like View and Edit.
If view parameter checked you can view data.
If Edit you can edit data. like date time, motor action,
Is any one has Developed application on editing parameter on web server. i searched in Google where most of project on basic of controlling action of motor.led lamp etc . bUt i am looking for example code where i can assign value on web server and find change in view perameter window.

Is there any way to create our own customised tag and link to arduino.

for example add to nos.
i have two variable A and B
c is output variable
c= a+b;
Where A and B can assigned on webserver and c check out put