Are you looking to add more spheres to your OBJ in ZBrush? Here's a step-by-step guide to help you out.

Step 1: Open your OBJ file in ZBrush. Once you have your file open, navigate to the tool palette and select the sphere tool.

Step 2: With the sphere tool selected, click on the canvas to create a new sphere. You can adjust the size and placement of the sphere using the draw, move, and scale tools.

Step 3: To duplicate the sphere, simply press 'Ctrl' and drag the sphere to create a copy. You can repeat this process to add as many spheres as you need.

Step 4: If you want to merge the spheres with your original OBJ, you can use the Boolean operations to combine the meshes. Simply click on the Subtool palette, select the Merge option, and choose the Boolean operation that best fits your needs.

Step 5: Once you have added and arranged all the spheres, you can fine-tune their placement and shape using the sculpting and editing tools in ZBrush.

And there you have it! With these simple steps, you can easily add more spheres to your OBJ in ZBrush. Whether you're creating a character, environment, or any other 3D model, this technique can help you enhance your work and bring your vision to life. Happy modeling!