Let us describe how it can be done using this blog (Robotics for Children) as an example:
There are 2 individual posts each (as of 13 December 2014) for these 2 labels - Sensors and Building from scratch.
Type the title of of the first category (Sensors) and bold it by clicking on b. Add this HTML line break tag <"br> at the end to start a new line.
Open those 2 label search pages (Sensors and Building from scratch) and note down the post titles and the permalinks (individual post URLs).
Thus in the (Sensors search page, these are the post titles and post permalinks:
|Post title||Post URL|
|About Lego WeDo tilt sensor||http://robotics4children.blogspot.com/2014/11/about-lego-wedo-tilt-sensor.html|
|Experiment: LEGO WeDo distance sensor (motion sensor)||http://robotics4children.blogspot.com/2014/07/experiment-lego-wedo-distance-sensor-motion-sensor.html|
You will get a pop-up window
Now for the first label/category which in our example is SENSORS. Type the text SENSORS and old it to make the category stands out. Add a HTML line break tag <br> to make the following text start on a new line.
Then in the box, list down the titles of the posts with that label. Highlight a post title and click on the hyperlink icon .
A pop up window will appear for you to enter the URL of that post (see screenshot below)
Just type or copy-paste the URL of the selected post into the URL field. Again type the line break code <br> at the end to start another new line.
Repeat for the second post (and ad infinitum).
Repeat the above for the second lable (category). The final result should look something like this: