What you want to do then is load in your CSV or XLS file using the XLS Reader or File Reader node.
You may want to group your documents first according to the Category. So use the GroupBy node, choose to Group By the Category column, and in the aggregation section, choose to Concatenate the Capability column. This way, you can have all the Capability text associated with the Category.
Then use the "Strings to Document" node in KNIME Labs/Text Processing.
In the node config, choose to have the Title as the Category column, and the Full Text as the Capability column. This way we can relate the words or phrases to your category column later.
You now need to tag the appropriate words in the document, you can do this with POS Tagger which identifies any "Parts of Speech" words such as Nouns, Verbs etc. However, if you want to identify specific phrases like "Common Map" then you will be best to use the "Dictionary Tagger" node and supply a hand written text file of phrases you want to be tagged into the second port. Select the tag type you wish to apply to the words or terms, remember this for later.
To pull out all of the words, then use the "Bag of Words" node. Words or phrases will have a tag if it matched your list in the Dictionary Tagger. You can then filter all the Bag of Words to leave just your tagged words if you like using the Standard Named Entity Filter node choosing the Tag type you specified earlier to filter for.
If you wish you can also use the TF node to calculate the frequency to which the word or phrases you have left appears in each document, 1 being very high, 0 being very low. If you then use the "Term to String" node to get all your phrases into a string cell,and the "Document Data Extractor" to pull out the title, you will then have all the phrases with their frequency and the category they came from. You can then use a graphing node to display the frequency of each phrase for each category.
You may also want to do a duplicate branch of the above workflow having the Requirements Source column being manipulated instead of the category column so you can analyse this in the same way.
To be really fancy, you can get KNIME to automatically generate the graphs for you using the BIRT reporting facilities, but this requires quite abit more learning.
Hope this helps and is towards what you are trying to achieve,