Declension table of ?upastava

Masculine	Singular	Dual	Plural
Nominative	upastavaḥ	upastavau	upastavāḥ
Vocative	upastava	upastavau	upastavāḥ
Accusative	upastavam	upastavau	upastavān
Instrumental	upastavena	upastavābhyām	upastavaiḥ upastavebhiḥ
Dative	upastavāya	upastavābhyām	upastavebhyaḥ
Ablative	upastavāt	upastavābhyām	upastavebhyaḥ
Genitive	upastavasya	upastavayoḥ	upastavānām
Locative	upastave	upastavayoḥ	upastaveṣu

Compound upastava -

Adverb -upastavam -upastavāt