install tumbleweed with arch linux

I have arch linux installed and now I want to dual boot tumbleweed with it(Don’t want to use virtual box) .
how can I install it?

Assuming you have empty unpartitioned space just install it to the empty space. Depending on boot (MBR or EFI) it should become the controller if MBR with EFI you may have to set the default boot to your chosen OS then that OS’s boot manager should give you the choices

I have GPT partition.

It’s GPT partition.

so , there will be 2 / partition .will it work?

yes, that won’t be a problem. you can use a shared /home (if you already have a separate /home with arch) if you want.