For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aschnell:parted/openSUSE_Tumbleweed/home:aschnell:parted.repo
zypper refresh
zypper install parted
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aschnell:parted/15.6/home:aschnell:parted.repo
zypper refresh
zypper install parted
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aschnell:parted/15.5/home:aschnell:parted.repo
zypper refresh
zypper install parted