प्राचां कटादेः

Operational rule vidhi

The affix छ comes in the remaining senses after the words beginning with कद denoting the places of the East-folk.

Word by word (padaccheda)

Target प्राचाम् ṣaṣṭhī · bahuvacanaLeft context कट- आदेः pañcamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

प्राचाम् कट-आदेः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix छ comes in the remaining senses after the words beginning with कद denoting the places of the East-folk.
The word देशे is understood here also. The word प्राक् of the sutra qualifies देशे ॥ This debars अण् ॥ Thus कटनगरीयम्, कटघोषीयम्, कटपल्वलीयम् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.