How to create a new independent IAS tenant for newly provisioned SAP Cloud ALM tenant?

We were creating a provisioning request for SAP Cloud ALM and everything was o.k.
At the time of selecting the IAS tenant, it didn't let us choose a new, independent one just for SAP Cloud ALM.
Our only option was to select an existing IAS tenant in our landscape to be connected to our SAP Cloud ALM tenant.

We do not want our existing Productive IAS tenant to be shared with SAP Cloud ALM.
How can we create a new IAS tenant, just for our SAP Cloud ALM tenant?

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