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LP-MSPM0G3507: Adding DriverLib source to existing projects

Part Number: LP-MSPM0G3507

As mentioned in the https://software-dl.ti.com/msp430/esd/MSPM0-SDK/1_20_00_05/docs/english/driverlib/mspm0g1x0x_g3x0x_api_guide/html/index.html  I am trying to add DRIVERLIB SOURCE to the existing project so that I can understand the code in a better way and if needed make changes. In the first step it mentions to delete driverlib.a . 

When I open my properties in ccs theia this is what I get.

I cant understand which file should I delete. Should it be the libc.a ?

And are there any examples for register level programming. I would like to understand as much as possible on what's happening behind the scenes.