Declension table of upasthāna

Neuter	Singular	Dual	Plural
Nominative	upasthānam	upasthāne	upasthānāni
Vocative	upasthāna	upasthāne	upasthānāni
Accusative	upasthānam	upasthāne	upasthānāni
Instrumental	upasthānena	upasthānābhyām	upasthānaiḥ
Dative	upasthānāya	upasthānābhyām	upasthānebhyaḥ
Ablative	upasthānāt	upasthānābhyām	upasthānebhyaḥ
Genitive	upasthānasya	upasthānayoḥ	upasthānānām
Locative	upasthāne	upasthānayoḥ	upasthāneṣu

Compound upasthāna -

Adverb -upasthānam -upasthānāt