ctrl+b adds one to the end, shift+alt+b lets you add as many as you want (up to several million, but don't add that many), insert adds one before the measure you have selected and shift+insert adds as many as you want before the selected measure. All of these are available through the menu item Add->Measures
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ctrl+b adds one to the end, shift+alt+b lets you add as many as you want (up to several million, but don't add that many), insert adds one before the measure you have selected and shift+insert adds as many as you want before the selected measure. All of these are available through the menu item Add->Measures