Managing calendar

Just got an idea about google calendar. Note it could be MS Outlook calendar or Lotus Calendar or whatever. All of them have the same format.

I divide all the tasks for the day in 3 groups:

1. To do sitting with computer and using Internet
2. Meetings and calls
3. At home (cleaning, buying etc)

But Google calendar does not have such option to divide these groups:

Instead, it offers to highlight tasks by different colors. However, it is time-consuming option. Especially, if you use it over the phone.

So, for me as at now the best option is to choose time frames for each group:

1. Night is for Internet tasks. I am sure that no other tasks will be assigned for night, until 8-9 am. No meetings are appointed at night.
2. Day is for meetings and calls.
3. Evening is for homework. Of course, I can do some homework earlier. But in this case evening means just 3rd group tasks, not the evening time.