You use the business catalogs to provide users access to the apps relevant for their business functions. Business catalogs are collections of apps that are grouped by business roles or scenarios. You assign business catalogs to business roles to grant users access to the apps they need to perform their tasks. Reference: https://help.sap.com/viewer/65de2977205c403bbc107264b8eccf4b/Cloud/en-US/7e30637d0a0545f99f6a65242a44940d.html

Some of the reasons you cannot remove a test process from a test plan are:
Data binding exists with another process
The test plan has already been executed These reasons prevent you from deleting a test process from a test plan because they would affect the integrity and validity of the test results. The test plan user not being created yet or the test process not being made visible do not prevent you from removing a test process from a test plan. Reference: https://help.sap.com/viewer/product/SAP_S4HANA_CLOUD/latest/en-US

You can download a .CSV file with the list of users in the Maintain Business Users app. This app allows you to manage the user accounts and authorizations for SAP S/4HANA Cloud. You can also use this app to upload a .CSV file with user data to create or update multiple users at once. Reference: https://help.sap.com/viewer/65de2977205c403bbc107264b8eccf4b/Cloud/en-US/f7a9d7c86f4740a09ed5d3c3981b8f1d.html

When setting up integrations with external systems, you should create one communication arrangement for each communication scenario you are implementing. A communication arrangement is a configuration that defines how your system communicates with an external system using a specific communication scenario. A communication scenario is a predefined integration content that describes the inbound and outbound communication between your system and an external system using a specific communication protocol and interface. Reference: https://help.sap.com/viewer/product/SAP_S4HANA_CLOUD/latest/en-US

Some services that SAP delivers as part of RISE withSAP S/4HANACloud solution are:
Release upgrade planning
Business process configuration
RISE withSAP S / 4 HANACloudis an offering that provides customers with everything they need to transform their business withSAP S / 4 HANACloud , such as subscription licenses , implementation services , cloud infrastructure , embedded analytics , etc