Utilize the command gcloud iam combine-roles --global to merge the two roles into a new custom role.

Within one of your projects, navigate to the Google Cloud Platform Console under Roles, select both roles to merge them into a new custom role. Then, use gcloud iam promote-role to elevate the role from a project level to an organization level.

For each project individually, go to the Google Cloud Platform Console under Roles, select both roles to combine them into a new custom role.

At the organization level, access the Google Cloud Platform Console under Roles, select both roles to combine them into a new custom role.