UIM to adding storage into existing service manager

Dear Expert, i have an question here regarding the service manager storage. If i want to adding another 1TB storage capacity into the existing service manager, i just choose on the service manager --> storage and key in the capacity i want. then done and provisioning it? please correct me if i'm wrong. Do i need to manually add in the Lun from my VNX? 2nd question which is In future, if i want to remove the 1TB capacity from the service manager, i just select the service manager and edit and remove the storage capacity? and provisioning it again. please correct me if i'm wrong. Does it affect my current VBlock configuration? Thank for the help.