Install any Bolt Component via npm as it's docs suggest. If you were going to install the Card, you'd run:

npm install --save @bolt/components-card

Then add it to .boltrc.js:

module.exports = {
  buildDir: 'www/build',
  components: {
    global: [
+     '@bolt/components-card', 
    ],
    individual: [
    ],
  },
};

Continue to do so with as many components as you'd like.