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No yuo don't, these ad groups are all in the same campaign. so if your campaign is call travel, once you click on travel you then go and set up your different adgroups, your campaign settings are then relevant for all the ad groups in that campaign, you can of course still set each keyword bid individually if you want.
so your daily budget, country setting etc relate to your ad groups as a whole.
so if you have three adgroups and your campaign budget is $50 per day then the total of the three campaigns over a month will never exceed $1500 (assume 30 days to a month).
The daily budget is averaged over the month. So some days it may exceed $50, some days under, if it goes over for the period google will credit your account with an "over delivery charge"
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