can anyone tell me how to make a drumroll in cubase? or link to a site with a tutorial? thanks

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this is it.

just make many copies of a drum sample and postion them closely together snaping to the ruler, so that your samples are positioned equaly apart in sync like on every 1/16th note after the original or how ever often you choose.

You can do the above, but there are better ways.

Use a sampler. I use Halion which is really good once you understand how to use it properly. Load in your sample and attach velocity to amp release and volume (Volume positively and amp release negatively), but have the amp release on full as default. Now draw in the notes, making them closer and closer as yuo would in a drum build. Make the velocity get stronger as you get further on. This will make the drum build for this sound get louder but also the release shorten up so that everything doesn't go haywire like it can when you have to many kick drums rolling together. Load up another sound (snare, ride, etc.) onto another channel in the sampler wired to a different audio channel so that you can control different velocity adn filter parameters for this sample. Then build this sound further into the build.

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1 out of every 4 people in this country are mentally disturbed. Look at your 3 closest friends. If they seem okay, then you're the one.

what about Reason, how can i make some decent drum rolls with that?

also can i make the drum roll any length for the buildup?

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Use either redrum or the NN19. They both respond to midi.
If they don't have velocity assignments for the functions you want, then you can always just automate them.

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1 out of every 4 people in this country are mentally disturbed. Look at your 3 closest friends. If they seem okay, then you're the one.

Both xDaDXeRx & hey cheggy gave viable solutions. Another approach is to use VST "drum machines" such as:

LinPlug's RM IV
Steinberg LM4 MKII

They combine sampling with synthesis with a UI designed for drum patterns. They also have features specific to drumming like RM IV's "Humanizer" which *slightly* variates velocity and timing to make the patterns sound more human-like.