Writer, the word processor in OpenOffice.org, uses many of the same keyboard shortcuts as MS Word. The shortcuts for selecting, editing and formatting text follow established standards. Whereas Writer has a keyboard shortcut for 'Paste special' (Ctrl + Shift + V) - something missing in Word - it does not have one for changing the case of selected text. It is possible to set up new shortcuts in Writer, and I will show you how to set up one to make the selected text upper-case and another to make it lower-case.
In Writer pull down the 'Tools' menu and click 'Customise'.
Select the 'Keyboard' tab, as shown below.
You can see all the default keyboard shortcuts, and some spare key combinations.
I have chosen Ctrl + Shift + U to make selected text upper case, and Ctrl + Shift + L to make it lower case.
Find Ctrl + Shift + U in the 'Shortcut keys' list. Select 'Format' from the 'Category' list, and then 'Uppercase' from the 'Function' list. Click the 'Modify' button to make the change.
Repeat the process selecting Ctrl + Shift + L, the 'Format' category, and the 'Lowercase' function, not forgetting to click the 'Modify' and then the 'OK' buttons when you are done.