Hi Kaniarasan,
We have prepared cascading multiselect Combobox sample with MultiSelectionComboBox which tries to meet your requirement. In this sample, we have update ComboBoxAdv items based on MultiSelectComboBox selected items. Please download the sample from the following link.
If you requirement different from this sample, could you please provide more information about your requirement that would be helpful for us to resolve your problem earlier.
Regards,
Mariappan S.