It depends of what you want @sixu
Let me clarify first a thing, for ids 800-899 you must create a new reslist class, because they do not exist on vanilla 2moons. You can handle and edit most of vars requests through uni1_vars table and VarsBuildCache.class.php file.
To create a class, go to the end of the VarsBuildCache file, add a case called 800 and tell $reslist['newclass'][] = $elementID.
But if that elemtns you want to split are class 100 (Research) with those IDs (800-820), then on your new page file use a foreach(range(800,820) as $id).
Let me clarify first a thing, for ids 800-899 you must create a new reslist class, because they do not exist on vanilla 2moons. You can handle and edit most of vars requests through uni1_vars table and VarsBuildCache.class.php file.
To create a class, go to the end of the VarsBuildCache file, add a case called 800 and tell $reslist['newclass'][] = $elementID.
But if that elemtns you want to split are class 100 (Research) with those IDs (800-820), then on your new page file use a foreach(range(800,820) as $id).