If you mean the exact term “bhāvanā-samvāsaḥ”, I do not recognize it as a standard word used in Tattvārtha Sūtra.

In Tattvārtha, related concepts like bhāvanā may appear in a broader Jain sense, but this exact compound does not seem to be a common Tattvārtha term.

If you share the exact Sanskrit spelling, I can help compare it with Jain usage more precisely.