Declension table of ?upaśayastha

Neuter	Singular	Dual	Plural
Nominative	upaśayastham	upaśayasthe	upaśayasthāni
Vocative	upaśayastha	upaśayasthe	upaśayasthāni
Accusative	upaśayastham	upaśayasthe	upaśayasthāni
Instrumental	upaśayasthena	upaśayasthābhyām	upaśayasthaiḥ
Dative	upaśayasthāya	upaśayasthābhyām	upaśayasthebhyaḥ
Ablative	upaśayasthāt	upaśayasthābhyām	upaśayasthebhyaḥ
Genitive	upaśayasthasya	upaśayasthayoḥ	upaśayasthānām
Locative	upaśayasthe	upaśayasthayoḥ	upaśayastheṣu

Compound upaśayastha -

Adverb -upaśayastham -upaśayasthāt