How to cut image of 5x5 from 1024x1086 image size

[marpet]

I showed some time ago how this can be done with a graph.

Split product into tiles by pixel region

The attached graph shall show how to create equally sized tiles out of one product. It assumes that the product has a known size and if applied to multiple products that all have the same size. if this does not applies the products need to be made equal. For this purpose the Resampling can be used. How to do this is not part of this graph description. Obviously it can happen that at the border the size can not be equal anymore. In this case you need to adapt the pixel region accordingly. This …

But as I know understood you want certain 5x5 windows and not split the whle image into 5x5 pieces.
For the manually selected regions you can set pins at the center and then use the pixel extraction tool (Raster / Export / Extract Pixel Values)
There you can specify a window and you can enable the export of sub-scenes with a specified border size.

The other option is to write a python script which usees GPF and configures the Subset operator.