you would need to create a linking table to link the available sizes to the models
modelSizes:
modelSizeID - Primary key Column
modelSizeSizeID - Foreign key column, relates to size.sizeID
modelSizeModelID - Foreign key column, relates to model.modelID
the recordset to populate the sizes Dynamic array will be a join query:
SELECT modelSizes.modelSizeModelID, Size.sizeID, Size.SizeName
FROM Sizes
INNER JOIN modelSizes
ON modelSizes.modelSizeSizeID = Size.sizeID
Then in the populate list from array, set the modelSizes.modelSizeModelID as the parent ID, Size.sizeID as the Child ID and Size.SizeName as the child label
