Not sure if you can need only 1 OQ for all products. Key process parameters need to be established at this point, so you you need to take product type into account, and revalidate when there's changes in your product portfolio
Since my comment was done so long ago, I suspect that I was referring too a CNC machine that may do the same operation(cutting) for multiple custom cutting programs.
Example: If you use a CNC mill and you typically use cutting tools ranging in size from 1mm to 25mm, then for the OQ, I would establish the precision of the mill for the 1mm, 12mm and 25mm cutting bits(with the justification that the precision of other "in between" sizes can be extrapolated) . I would run several custom cutting programs at the extremes of the table, low and high end of the cutting speed and feed speed and then measure the results to show where the mills limitations lie.
An example of multiple OQ would be a packaging line with multiple size boxes. Although you could theoretically establish a range of box sizes to run in one OQ, I suspect that it would be very difficult to try and capture the multitude of box configurations in one OQ, hence I would recommend a custom OQ for each product or product line.