Text Formatting ⇒ indentation

[Nitin varma]

can anyone please tell me how to change the Indentation of text in the middle of a document only for few lines

[mas]

Not clear what you want to achieve. But, a paragraph (or more) can have different left and right margins if you put them in a quote environment.

[frabjous]

You could also use a parbox or minipage. But it's true that you'd get a more straightforward answer if you said exactly what you were trying to do, and possibly even provide a minimal working example.