वा ह च च्छन्दसि

Operational rule vidhi

Optionally the affix ह also comes in the छन्दस् (Vedas) after the word किम् in the Locative -7th case as well as other affixes.

Word by word (padaccheda)

Indeclinable वा avyayaWord ह Indeclinable च avyayaRight context छन्दसि saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Word Case not marked in the source data.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

वा ह च छन्दसि

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

Commentary

Optionally the affix ह also comes in the छन्दस् (Vedas) after the word किम् in the Locative -7th case as well as other affixes.
Thus कुह 7.2.104, क, कुत्र. As in Rig Veda VIII.62.4: कुह॑स्थः॒ कुह॑जग्मथुः कुह॑ श्ये॒नेव॑ पेतथुः ॥ 'Where are ye two? Where are you (or did you) going? Where do you fall like eagles?'.

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