Answer

What you are likely remembering is a Jain comic about “Alexander and Kalyaan Muni”, which Jain Comics lists as one of its titles. The Shatkhandagam part matches the traditional Jain account that Acharya Dharasena taught the knowledge to Pushpadant and Bhutabali, and that they wrote Shatkhandagam; Jain sources also say this was done to preserve the knowledge, and later Virasena composed the Dhavala commentary. ( jaincomics.wordpress.com)

Explanation

So your memory was probably of a Jain story-comic or anthology, not just a single text-only book. One tale in it seems to have been the Sikandar/Alexander and Kalyaan Muni story, while another tale explained the background of Shatkhandagam and why it was written down. That is the most likely match based on the titles and the traditional story pattern. ( jaincomics.wordpress.com)

Spiritual Understanding

The Shatkhandagam tradition is important in Jain Dharma because it shows how Jain wisdom was carefully preserved by worthy Acharyas and Munis when there was danger of loss. The Alexander and Kalyaan Muni story, on the other hand, teaches the contrast between worldly power and the peace of Jain spiritual wisdom. ( jainqq.org)

Takeaway

Your old comic was most likely a Jain Comics title featuring “Alexander and Kalyaan Muni” plus a Shatkhandagam-related story. If you remember the cover style, language, or any scene from it, the exact comic can often be identified very closely.