How to create a location, there is no Organization to select the location
Going to make some assumptions as you did not provide much supporting information of how to arrived at your question.
If when you are the project creation wizard – you see the options for Project Name, Billing Account, followed by organization, and then you see an option to select a location but you are not able too, even when you click browse.
Then likely you are linked to an organization; assumption is that your using your work email address, or requested to be linked to an organization, however you don’t have any permissions assigned at the organization level, and therefore you cannot select the location.
You need more power :).
I think GCP Sandbox does not support such kind, another way is the get your own gcp account and try on