I have a list order, i am trying to have a dropdown which shows the items and other which shows size of those items.i want the other dropdown to show size only relevant to item selected in first drop down like a typical cascading drop down but it doesn't works.
P.S. i have a plan to place these dropdowns in repeate control but currently testing in normal mode. I have not connected the controls to any field (by text /id).
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Anyway - if the list that should be filtered out is no way related to the one that is used for filtering, then you are not able to do it anyway - even with a script - how will you know which values should be left?
I think you should add a lookup (multi?) field to the list that is going to be filtered out by the values from the first list and the simply use the settings of the lookup field in form, to filter using "by control's value" option: