themes-wordpress/dalston/block-extends/extend-columns-block.js

( function( blocks ) {
	blocks.registerBlockStyle( 'core/columns', {
		name: 'full-bleed',
		label: 'Full Bleed'
	} );
	blocks.registerBlockStyle( 'core/columns', {
		name: 'project',
		label: 'Project'
	} );
}( window.wp.blocks ) );