Declension table of ?upastara

Masculine	Singular	Dual	Plural
Nominative	upastaraḥ	upastarau	upastarāḥ
Vocative	upastara	upastarau	upastarāḥ
Accusative	upastaram	upastarau	upastarān
Instrumental	upastareṇa	upastarābhyām	upastaraiḥ upastarebhiḥ
Dative	upastarāya	upastarābhyām	upastarebhyaḥ
Ablative	upastarāt	upastarābhyām	upastarebhyaḥ
Genitive	upastarasya	upastarayoḥ	upastarāṇām
Locative	upastare	upastarayoḥ	upastareṣu

Compound upastara -

Adverb -upastaram -upastarāt