A Study to Investigate the Safety of Novel Dose Ramp-up Schedule(s) When Initiating Sonrotoclax in Participants Treated for Blood Cancers.

Inclusion Criteria

1. Stable ECOG Performance Status ≤ 2. 2. Adequate organ function and no very recent transfusion or blood growth factor 3. Participants of childbearing potential must be willing to use a highly effective method of birth control and refrain from egg donation for the duration of the study and for ≥ 90 days after the last dose of sonrotoclax or ≥ 30 days after the last dose of zanubrutinib, whichever is later. 4. Confirmed diagnosis of CLL, based on Hallek et al 2018, and requiring treatment due to certain features of their disease 5. At least 1 measurable lesion based on computed tomography (CT)/magnetic resonance imaging (MRI) and no history of prolymphocytic leukemia or Richter's transformation.

Exclusion Criteria

1. Participants unable to comply with the requirements of the protocol 2. Serologic status reflecting active viral HBV or HCV infection 3. Positive HIV serology (HIVAb) status unless certain conditions are met. 4. Participants with any major surgical procedure ≤ 28 days before first dose of study treatment 5. Prior systemic treatment for the CLL 6. Uncontrolled autoimmune hemolytic anemia or immune thrombocytopenia requiring treatment NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.