On the IOS XR it’s a bit different, but still pretty easy.
RP/0/RSP0/CPU0:router01#conf t RP/0/RSP0/CPU0:router01(config)#commit replace This commit will replace or remove the entire running configuration. This operation can be service affecting. Do you wish to proceed? [no]: yes RP/0/RSP0/CPU0:ios(config)#