It seems you may be referring to “Shatkhandāgama” (often misheard as “Satlakh”). In Jain literature there is no standard sutra called “Satlakh.”

About Shatkhandāgama (Digambar tradition):

• Name: Ṣaṭkhaṇḍāgama (Scripture of Six Sections)
• Authors: Āchārya Puṣpadanta and Āchārya Bhutabali
• Basis: They wrote it from the oral teachings of Āchārya Dharasena on Mount Girnar.
• Period (traditional): Around the 2nd century CE
• Importance: It is one of the two most revered Digambar canonical works (the other is Kaṣāyapāhuda of Āchārya Guṇadhara). It deals deeply with karma doctrine and its subdivisions.

Shwetambar note:

• The Shwetambar canon is a different collection (Āgamas). “Shatkhandāgama” as such is not part of the Shwetambar Āgamas; instead, Shwetambar tradition preserves its own set of canonical sutras compiled later at Valabhi.

If by “Satlakh” you meant something else (for example, a local/colloquial text or a specific stotra), in Jain scriptures there isn’t a recognized sutra by that exact name; the closest, well-known work that sounds similar is the Ṣaṭkhaṇḍāgama described above.