Declension table of ?samupasthāna

Neuter	Singular	Dual	Plural
Nominative	samupasthānam	samupasthāne	samupasthānāni
Vocative	samupasthāna	samupasthāne	samupasthānāni
Accusative	samupasthānam	samupasthāne	samupasthānāni
Instrumental	samupasthānena	samupasthānābhyām	samupasthānaiḥ
Dative	samupasthānāya	samupasthānābhyām	samupasthānebhyaḥ
Ablative	samupasthānāt	samupasthānābhyām	samupasthānebhyaḥ
Genitive	samupasthānasya	samupasthānayoḥ	samupasthānānām
Locative	samupasthāne	samupasthānayoḥ	samupasthāneṣu

Compound samupasthāna -

Adverb -samupasthānam -samupasthānāt