I need to get folder id by passing folder name (which I will have). Is there a p

You will want to look at the Custom Content Functions shared component at:
forum.appian.com/.../summary
which allows you to use the custom function findFoldersByName().

Hey mahesh, you can simply maintain the folder in any constant then just pass the constant in to integer function, for example your constant name is EXAMPLE then make a rule like tointeger(cons!EXAMPLE) it will simply return you the ID of the document.

Both suggestions helped to resolve my issue - Thank You!

Glad that it helped, I actually meant ID of folder not the document, I beg your pardon for mistyping

Not at all. Your post actually gave me some ideas.