I assume you mean the boss fight, right? If so, you place portals so that the rocket turret shoots turrets at GLaDOS, knocking off a core. Get the core and then incinerate it. Do this 3 times in 6 minutes.
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save the tnt and explode boombot to the portal
You send a portal on a ceiling get on the machine with fan jump over you wont make it so then have a portal on floor .:P it is complicated so sry I cannot explain any better.
you do a poo then eat it the find the panda hinding behind the dishwasher .... EASY !
When the boombot bounces back up at you, make a bomb that causes it to go twords the end portal.
keep pressing the red button to slide the wall up. then run as fast as you can to the portal