Converting to a booster do i remove the base

We recommend you contact Graco for assistance

This car seat does not convert to a booster. It becomes a "Belt-positioning booster". The back and headrest remain while using as a booster. You remove the 5-point harness and use the car's shoulder strap seat belt.
The belt positioning is done by the plastic parts at the top on either side of the seat.
Following is the link to get the instructions for this seat: http://www.coscojuvenile.com/usa/eng/Instructions

Hi,
please feel free to call at 1-800-544-1108 and they can send you a manual in case you dont have it.

*To convert the car seat into a booster seat, turn the car seat over and remove the pin that holds the base in place. tHEN REMOVE THE BELTS AND THE BUCKLE.
*To remove you need to bend/twist the keeper until you can push it UP through the seat and remove the belt/strap. It is now a booster seat for use with a lap/shoulder belt in the car. Store all the parts you removed in a ziploc bag for when your child outgrows it so it can be reused

PLEASE RATE MY HELP :)

Turn the car seat over and remove the pin that holds the base in place. Then remove the belts and the buckle. voila, a booster seat.

To change it into a belt positioning booster seat, you remove the harness straps completely and use the positioning clips on the side of the carseat (up by the head) to position the automobile's seat belt to the appropriate position.

Take the base off if it has one, either clips, screws, or a metal rod holding it on. Take the belts out. They should slide off the clip at the back of the seat, then unthread belts from buckles. The buckle/strap between the legs usually has a metal keeper below the seat. To remove you need to bend/twist the keeper until you can push it UP through the seat and remove the belt/strap. It is now a booster seat for use with a lap/shoulder belt in the car. Store all the parts you removed in a ziploc bag for when your child outgrows it so it can be reused.

The Seat NOW is SIMPLY a BOOSTER, And Thus 5 Point Can Be Removed, and The VEHICLE SEAT BELT Can Now Be Used.

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Converting the seat to a booster: (Alpha Omega Elite Deluxe 2004 version, Eddie Bauer)
After all said and done, the base can probably be left on, it helps to recline the chair when the child is asleep. If you want to leave it out, the manual says the base can be removed for narrow vehicle seats or airline use. Locate the center bar at the bottom of the seat, push the tab at the end of the bar and pull the bar out. The seat can then be separated from the base. The seat has a "kickstand" that can be pulled out to sit the seat upright. Put the bar back in the base so you don't lose it.

To remove the harness, remove the base first. Then from the back of the seat, unfasten the harness from the harness bracket. Store the bracket by looping it behind and around the back spine of the shell. You can unthread the harness from that point and pull it out. From the bottom of the seat, locate the buckle's metal clip. Insert the clip up through the shell and pad, from the front pull the buckle free from the shell. Lock latch plates into buckle for safekeeping.

Once the seat is converted to adult straps don't use the latch system; hook the hooks together to keep it from swinging around, and place the top anchorage strap behind the seat with the anchor hook under the seat.

I called Cosco at 1-800-544-1108 with my model number and manufacture date and they were happy to email the instructions to me in PDF format. I assume they would have sent them US Postal if I'd asked.