Change of Career Path?

One of my bosses offers me a position to be a sales person in my company. I'm doing documentation, project service coordination work and a little bit of sales coordination work. This offer is totally different from what I am doing. My boss think that it's such a waste to let me just sit on the position I'm holding because I'm so well verse of my company's products and services, I can interact with people, and I can work well with my Sr.Sales Manager. He asked me to have a serious thought about it and let him know.

After a night's thought, I think I'm going to turn down the offer, and let my boss know what's my expectation to the company while I'm still working here. Hope everything is going fine after this.