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Strongly recommend putting your efforts to upgrading off of 11.2 since its an unsupported version. Cognos reports were phased on in the next version after the one your are on:
https://www.ptc.com/en/support/article/cs352015?source=Bloop
Short of that, have you gone through the available help docs such as this knowledge hub:
https://www.ptc.com/en/support/article/CS218630?source=search
I think you need a more targeted question but keep in mind that this knowledge is fading since many have moved on from this version.