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if you mean that you can't extend the precomp although you have extended the timeline, you can't extend it because the precomp is a specific length just as this precomp is (the one you've extended). so open up that precomp that you're trying to extend and go to composition settings and extend it by timing in a new length....

if you knew all this, however, i've just made a fool of myself and i shall crawl back where from i came.