Yeah, no need to remove the fixed cup. Got a way to line that cup with lots of grease? I usually just squirt some on my finger, then stick my finger in the spindle hole in the cup, and wipe it in the races of the cup. Go 'round and do several of those so the cup is well-filled. Then you can stick the balls in the same way. Or drop them them in with tweezers or something. Then, lower the LONGER end of the spindle...frame laying on its side of course...down into the bottom bracket shell and captured the balls against the fixed cup with spindle. Then, lower other, adjustable cup, also filled with grease and 11 balls, down onto spindle and screw in to finger tight. Screw lock ring on adjustable cup. Upright bike in stand and adjust bottom bracket.

Careful not to dislodge any of the balls on either side doing this. Use plenty-O-grease. Too much is better than too little and it holds the balls in better.
Balls should be completely covered with grease, or nearly so.

No "from" 9 to 11. Has to be the right number. Should be eleven, 1/4 inch balls. Each side.