Answer

Dvitiyopashama means the second subsidential right-belief in Jain philosophy. It arises in a saint who is in the 7th gunasthana and is preparing to move to the 8th gunasthana on the subsidential ladder. If the first subsidential right-belief does not fall down, it changes into this second kind after its duration ends, which is said to be at most one antarmuhurta. ( wisdomlib.org)

Explanation

In the process of viśanyojana, the soul transforms bonded karmic matter from one sub-class into another. In this context, the saint changes the four error-feeding passions into lesser passions and causes the subsidence of the three right-belief-deluding sub-classes: mithyātva, samyaktva-mithyātva, and samyaktva-prakṛti-mithyātva. This transformation is done through karaṇa-labdhi, namely Adhah Karaṇa, Apūrva Karaṇa, and Anivṛtti Karaṇa. ( wisdomlib.org)

Spiritual Understanding

Spiritually, this is a very subtle stage of purification. The soul is no longer in ordinary delusion; instead, wrong belief and harsh passions are being softened and reorganized, so the soul becomes fit for higher spiritual progress. This is an advanced inner transformation, not just a change in outward conduct. ( wisdomlib.org)

Takeaway

So, in simple words: Dvitiyopashama is a very advanced subsidential state of right-belief, and viśanyojana is the karmic transformation process that helps bring it about. ( wisdomlib.org)