Outdoor landscape lighting from lowes

Bought a lighting kit from Lowe’s and they have worked great for me. I am putting a fountain and want to add landscape lighting in front of my house and in front of the fountain. I have wire leftover from the first kit I bought and will buy a second kit for this next project. Is there a way to connect the leftover wire from 1st kit to the wire of the new kit to give me more length to put lights?
The first lights I put up won’t be around the new set up so I need another transformer and timer to do this. I need about 80 ft of wire and 50ft is what comes with the kit. The extra wire I have would get me to 80 ft.