How do I remove sub-processes

Hi All,

I want to modify the process flow and remove some of the subprocesses that are no longer valid.

Here is the list of the process, and the highlighted portions are what  I want to remove:

Process Orchestration
CCCBOLAccountOrders
• CCC_BOL_AccountDef_Assign
• CCC_BOL_ADSGroup_Assign (highlighted)
• CCC_BOL_AzureSubscriptions_Assign
• CCC_BOL_O365_Assign
• CCC_BOL_O365_DistributionGroups_Assign
• CCC_BOL_SAPCUAChild_Assign (highlighted)
• CCC_BOL_SAPCUAGrp_Assign (highlighted)
• CCC_BOL_SAPParameter_Assign (highlighted)
• CCC_BOL_SAPRole_Assign (highlighted)

How would I go about removing them on the Designer, and also, is it possible to see the impact of the changes before applying the change?

Thanks