Dual boot, but i want to install over an existing linux

hi people!
i have laptop with a win7/manjaro dualboot. i use linux for everything internet and daily use, after trying Clear linux live session i was impressed with it’s speed. can i just install it over manjaro and keep my win7 ? im not that good with grub issues so it worries me.
i found this post :

but this user kept his manjaro !
thank you in advance :slight_smile: