Declension table of ?upaśada

Masculine	Singular	Dual	Plural
Nominative	upaśadaḥ	upaśadau	upaśadāḥ
Vocative	upaśada	upaśadau	upaśadāḥ
Accusative	upaśadam	upaśadau	upaśadān
Instrumental	upaśadena	upaśadābhyām	upaśadaiḥ upaśadebhiḥ
Dative	upaśadāya	upaśadābhyām	upaśadebhyaḥ
Ablative	upaśadāt	upaśadābhyām	upaśadebhyaḥ
Genitive	upaśadasya	upaśadayoḥ	upaśadānām
Locative	upaśade	upaśadayoḥ	upaśadeṣu

Compound upaśada -

Adverb -upaśadam -upaśadāt