Here an example how to combine multiple text files into one large text file.
Here a imaginary situation: you have 3 text files named [text1.txt] [text2.txt] [text3.txt]
You want to combine these files into one single file named: [textall.txt]
You can use this quick and easy windows command in cmd console for is, just navigate to the directory and run:
type text*.txt > textall.txt
Now you have a textfile "textall.txt" in the same directory - which contains all the text from the 3 text files.