Declension table of ?kartitavya

Neuter	Singular	Dual	Plural
Nominative	kartitavyam	kartitavye	kartitavyāni
Vocative	kartitavya	kartitavye	kartitavyāni
Accusative	kartitavyam	kartitavye	kartitavyāni
Instrumental	kartitavyena	kartitavyābhyām	kartitavyaiḥ
Dative	kartitavyāya	kartitavyābhyām	kartitavyebhyaḥ
Ablative	kartitavyāt	kartitavyābhyām	kartitavyebhyaḥ
Genitive	kartitavyasya	kartitavyayoḥ	kartitavyānām
Locative	kartitavye	kartitavyayoḥ	kartitavyeṣu

Compound kartitavya -

Adverb -kartitavyam -kartitavyāt