"Excel Example Set - Supervised Machine Learning"

Hi there, im very new to Rapid Miner and Supervised Machine Learning. My task: I have like 500 sentences which I categorized by myself into six different cagetories. (1,2,3,4,5,6). Now I have another Excel with like 700 sentences but I didnt categorized them, I want RapidMiner to learn from the first Excel Set and apply it on the second Excel and categorize it with the six different categories. So I want RapidMiner to predict the categories. The Excel-Sets both have just two columns with sentence and category. But in the second Excel-Set the column category is empty. I would really appreciate if you could give me a hint. Many thanks.