I cannot think of a better model for corporate climbing than Guyspeak.com. I first worked in our mail room opening letters and delivering them to the GuySpeak guys. Then I was eventually given a promotion and allowed to type up a few answers that were immediately deleted. After that I worked in middle management where I answered questions on holidays and some weekends. Now, all these years later I type up answers to your questions from a well appointed yacht somewhere in the Adriatic Sea.
In all seriousness corporate structure can be hell; a pyramid, whose floors are divided by steel and gatekeepers. That said, the key to climbing is two-fold. Actually FOUR-fold.
1. Do your work and do it well. If you have to cover issues A-L, go the extra letters and come in Monday morning having completed M,N,O and P too.
2. Promote yourself. Given you've chosen to work in a corporate structure you will have to accept the fact that if a tree falls in a forest it doesn't matter unless the boss (and hopefully her superiors) catch wind of it too. This means be seen and heard. Don't be a brown nosing douchebag about it, but take credit for what you did and speak up - nobody promotes the mute. And that brings us to #3.
3. Connections. Use them/grow them. Like any other highly competitive industry, hell any field for that matter, who you know is as important as what you know. In truth it's the combination of opportunity and skill. Writing emails to mentors, going to panel discussions in your field, creating an online presence (linked In, etc) is vital to growing your star. Get in with you're your boss and make yourself known to your boss's boss. Follow the scene in your given industry. Opportunities usually don't fall from trees, they are cultivated from the ground up.
4. Trust your gut and check in with yourself. Set goals. Short term and long term. Assess your plan and redirect as needed.
If all else fails - apply to Guyspeak.com -- KIDDING!