WinCC OA 3.17 and SIMATIC Process Historian
There is no standard solution for this. Maybe you can use one of the WinCC OA interfaces (e.g. OPC Historical Data Access Server ) for this.
But by using the the SIMATIC Information Server and the WinCC OA Reporting feature, you have access to the WinCC OA historic data. That means: by using the SIMATIC information Server, you can show historical values from different SIMATIC Scada´s (WInCC OA included) and also from the SIMATIC Process Historian. Maybe this is enough for you and you don´t need to bring data from WinCC OA to the SIMATIC Process Historian.
For further information please refer to the WinCC OA documentation "Special functions --> Reporting --> SIMATIC Information Server "