Declension table of ?siddhasopāna

Neuter	Singular	Dual	Plural
Nominative	siddhasopānam	siddhasopāne	siddhasopānāni
Vocative	siddhasopāna	siddhasopāne	siddhasopānāni
Accusative	siddhasopānam	siddhasopāne	siddhasopānāni
Instrumental	siddhasopānena	siddhasopānābhyām	siddhasopānaiḥ
Dative	siddhasopānāya	siddhasopānābhyām	siddhasopānebhyaḥ
Ablative	siddhasopānāt	siddhasopānābhyām	siddhasopānebhyaḥ
Genitive	siddhasopānasya	siddhasopānayoḥ	siddhasopānānām
Locative	siddhasopāne	siddhasopānayoḥ	siddhasopāneṣu

Compound siddhasopāna -

Adverb -siddhasopānam -siddhasopānāt