Provisioning Time-Sensitive (TS) flows on dedicated infrastructures requires just calculating the time-slot dedicated to that service, which is then allocated in the superframes used by the schedulers running in the different nodes in the network. In such scenario, there is no impact on the flows already being served by the network as every TS flow has dedicated resources supporting it. However, in heterogeneous scenarios supporting TS and non-TS flows, the impact on existing non-TS flows can be very severe, and needs to be analyzed. In this paper, we overview a provisioning process that includes the use of a Network Flow Scheduler for reserving time slots for TS flows and a Digital Twin to accurately estimate the performance of the new and already deployed non-TS flows.