Declension table of ?upaśaya

Neuter	Singular	Dual	Plural
Nominative	upaśayam	upaśaye	upaśayāni
Vocative	upaśaya	upaśaye	upaśayāni
Accusative	upaśayam	upaśaye	upaśayāni
Instrumental	upaśayena	upaśayābhyām	upaśayaiḥ
Dative	upaśayāya	upaśayābhyām	upaśayebhyaḥ
Ablative	upaśayāt	upaśayābhyām	upaśayebhyaḥ
Genitive	upaśayasya	upaśayayoḥ	upaśayānām
Locative	upaśaye	upaśayayoḥ	upaśayeṣu

Compound upaśaya -

Adverb -upaśayam -upaśayāt