I HAVE NOT CREATED ANY RECORD FOR SAVING THE STATUS VALUES

Hi shrutj,
welcome.
a) this is very limited information 
b) how much experience to you have with appian? did you do the first online courses? what information are you missing to archive it?

hint: capslock in the title is not necessary. Capslock assembles a kind of screaming.

Thank you! I will not use capslock.

The information is: 

I have a user form and when the user fill and submit the form, the form goes to supervisor for approval or reject. 

So, i have to store the value of the task is assigned to supervisor, the supervisor has accepted and completed the process.

So, by that values we can prepare a pie chart to display.

Thank you! I will not use capslock.

The information is: 

I have a user form and when the user fill and submit the form, the form goes to supervisor for approval or reject. 

So, i have to store the value of the task is assigned to supervisor, the supervisor has accepted and completed the process.

So, by that values we can prepare a pie chart to display.

extend the record/cdt you are using with a text field "status", create an action to store the new status there and store the value in the db. pretty straight forward :) so what are you missing as information :)?