diff --git a/lib/project_config/project_config.spec.ts b/lib/project_config/project_config.spec.ts
index a955b725a..bb5370ef4 100644
--- a/lib/project_config/project_config.spec.ts
+++ b/lib/project_config/project_config.spec.ts
@@ -252,6 +252,34 @@ describe('createProjectConfig - flag variations', () => {
   });
 });
 
+describe('createProjectConfig - cmab experiments', () => {
+  it('should populate cmab field correctly', function() {
+    const datafile = testDatafile.getTestProjectConfig();
+    datafile.experiments[0].cmab = {
+      attributes: ['808797688', '808797689'],
+    };
+
+    datafile.experiments[2].cmab = {
+      attributes: ['808797689'],
+    };
+
+    const configObj = projectConfig.createProjectConfig(datafile);
+
+    const experiment0 = configObj.experiments[0];
+    expect(experiment0.cmab).toEqual({
+      attributeIds: ['808797688', '808797689'],
+    });
+
+    const experiment1 = configObj.experiments[1];
+    expect(experiment1.cmab).toBeUndefined();
+
+    const experiment2 = configObj.experiments[2];
+    expect(experiment2.cmab).toEqual({
+      attributeIds: ['808797689'],
+    });
+  });
+});
+
 describe('getExperimentId', () => {
   let testData: Record<string, any>;
   let configObj: ProjectConfig;
diff --git a/lib/project_config/project_config.ts b/lib/project_config/project_config.ts
index a41347916..756c8c058 100644
--- a/lib/project_config/project_config.ts
+++ b/lib/project_config/project_config.ts
@@ -114,6 +114,7 @@ const RESERVED_ATTRIBUTE_PREFIX = '$opt_';
 // eslint-disable-next-line  @typescript-eslint/no-explicit-any
 function createMutationSafeDatafileCopy(datafile: any): ProjectConfig {
   const datafileCopy = { ...datafile };
+
   datafileCopy.audiences = (datafile.audiences || []).map((audience: Audience) => {
     return { ...audience };
   });
@@ -155,6 +156,15 @@ export const createProjectConfig = function(datafileObj?: JSON, datafileStr: str
 
   projectConfig.__datafileStr = datafileStr === null ? JSON.stringify(datafileObj) : datafileStr;
 
+  /** rename cmab.attributes field from the datafile to cmab.attributeIds for each experiment */
+  projectConfig.experiments.forEach(experiment => {
+    if (experiment.cmab) {
+      const attributes = (experiment.cmab as any).attributes;
+      delete (experiment.cmab as any).attributes;
+      experiment.cmab.attributeIds = attributes;
+    }
+  });
+
   /*
    * Conditions of audiences in projectConfig.typedAudiences are not
    * expected to be string-encoded as they are here in projectConfig.audiences.
diff --git a/lib/project_config/project_config_schema.ts b/lib/project_config/project_config_schema.ts
index c33f013ae..f842179dc 100644
--- a/lib/project_config/project_config_schema.ts
+++ b/lib/project_config/project_config_schema.ts
@@ -202,6 +202,19 @@ var schemaDefinition = {
             type: 'object',
             required: true,
           },
+          cmab: {
+            type: 'object',
+            required: false,
+            properties: {
+              attributes: {
+                type: 'array',
+                items: {
+                  type: 'string',
+                },
+                required: true,
+              }
+            }
+          }
         },
       },
       required: true,
diff --git a/lib/shared_types.ts b/lib/shared_types.ts
index 40ad29a1f..870b55ddc 100644
--- a/lib/shared_types.ts
+++ b/lib/shared_types.ts
@@ -152,6 +152,9 @@ export interface Experiment {
   trafficAllocation: TrafficAllocation[];
   forcedVariations?: { [key: string]: string };
   isRollout?: boolean;
+  cmab?: {
+    attributeIds: string[];
+  };
 }
 
 export enum VariableType {