Is it possible to simulate the costing with new prices with all clouds and all clouds assigned to a specific tenant in 1 month and/or 1 year?
Are you looking for forecasting?
Yes.
Operations → Analytics → Cloud costing would show you the Month to Date and Projected Cost of the Month. We do not show for a year but can be done via custom reports.
For AWS cloud we do show reservation recommandation and saving plans recommendation of a year and 3 year plan.