Thank you once again for the clarification Petras.
The problem for 1d optimization is that, the code which can be found online mostly does not take initial bars of different length as an input (sheets in case of OpenNest), but a user needs to define one, and then the code will just show how many of those bars of that length are needed.
If this is not the case, then, most of them seem to always start nesting the ‘geo’ from the longest towards shortest, which may not yield the best solution.
Any input from your side on this issue, is welcomed.