Our tutorial video gives basic instructions, but if you wish to automate the operation, so the number of Excel output files varies from one day to another, depending on how many different values are found in a particular field (here [PO]), then you may wish to introduce an extra step to set up the Batch configuration file.

Start from the original file and isolate the target field (PO).
Then use the Aggregation block, so you end up with a list of unique values.
In the Field organiser block, click on the Tools button and select the option to add Batch configuration fields.



Now you can open the options for each field (clicking on the triangle button next to the field name), to either set an initial value (such as output type or destination folder) or formula for Filtering options:
"[Category]="+"["+[Category]+"]"

Result will be different filter choice for each line and each resulting output file.
You can do something similar to customise the output file names - see the attached demo file, where resulting files are called according to each Category field value + the extension.
[Category]+".csv"

Now that you've finished with the configuration file, you can follow the steps, as in video.
Tutorial video: http://tc.visokio.com/videos/?name=DataManagerBatchOutput&title=Batch&lang=gb

This process should work with a Desktop license, as long as you have a limited number of values in the [PO] field.
With the Server license, both steps can be automated using the Scheduler application.

Thanks Paola, setting up the config file works perfectly but I guess because of the license it couldn't publish more than three times.

Your alternative is to create multiple File output blocks, each with a Record filter block in front, while configuring the output file name manually.
http://tc.visokio.com/videos/?name=DataManagerFileURLOutput&title=File+%26amp%3B+URL&lang=gb