All you'll need to do is change the name of the file from "boldgrid-wedge-child" to "boldgrid-yourtheme-child" and update the styles.css file, which contains the line:
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All you'll need to do is change the name of the file from "boldgrid-wedge-child" to "boldgrid-yourtheme-child" and update the styles.css file, which contains the line: