Declension table of upastha

Neuter	Singular	Dual	Plural
Nominative	upastham	upasthe	upasthāni
Vocative	upastha	upasthe	upasthāni
Accusative	upastham	upasthe	upasthāni
Instrumental	upasthena	upasthābhyām	upasthaiḥ
Dative	upasthāya	upasthābhyām	upasthebhyaḥ
Ablative	upasthāt	upasthābhyām	upasthebhyaḥ
Genitive	upasthasya	upasthayoḥ	upasthānām
Locative	upasthe	upasthayoḥ	upastheṣu

Compound upastha -

Adverb -upastham -upasthāt