Yeelight Lighstrip: Cutting & Connecting Help

Hello, I purchased Yeelight LED Lightstrip Pro (Chameleon) along with 1-meter extension LED strips. I want to install the LEDs under each shelf of my 150 cm long display cabinet, so I need to cut and connect the LEDs. Can the cut pieces of the LED be used, and how can I join the cut LEDs together? Can anyone who has knowledge about this help me?

The extension light bar can only be connected and extended with the original light bar.