To set options for build options for the project (main project or subproject), select the Build tool node on the project tree to display the Property panel.
Select the phase tab and set build options by setting the necessary properties.
Compile phase: [Compile Options] tab
Assemble phase: [Assemble Options] tab
FAA Assemble phase: [FAA Assemble Options] tab
SMS Assemble phase: [SMS Assemble Options] tab
Link phase: [Link Options] tab
Hex output phase: [Hex Output Options] tab
Create library phase: [Create Library Options] tab
I/O header file generation tool: [I/O Header File Generation Options] tab