How to remove 1 item from the cart

[Oleafeon]

I have the following

{{ sc:cart:addItem }}
<input type="hidden" name="product" value="{{ product:id }}">
<input type="hidden" name="quantity" value="1">
<button class="btn btn-custom change-quantity">+</button>
{{ /sc:cart:addItem }}
{{ sc:cart:removeItem :item="id" }}
<input type="hidden" name="quantity" value="1">
<button class="btn btn-custom change-quantity">
    <i class="fas fa-trash"></i>
</button>
{{ /sc:cart:removeItem }}

But the remove Item removes the full line of the cart not just 1 item so lets say i have 4 items in my card of the same products and i want to end up with 3 how do i remove1 item from that product

[duncanmcclean]

You would have to use the {{ sc:cart:updateItem }} form to change the quantity of a line item.

[Oleafeon]

Okay i made the following to get it working thanks @duncanmcclean

{{ if quantity > 1 }}
{{ sc:cart:updateItem :item="id" }}
<input type="hidden" name="quantity" value="{{ quantity - 1 }}">
<button class="btn btn-custom change-quantity">-</button>
{{ /sc:cart:updateItem }}
{{ else }}
{{ sc:cart:removeItem :item="id" }}
<input type="hidden" name="quantity" value="{{ quantity - 1 }}">
<button class="btn btn-custom change-quantity">
    <i class="fas fa-trash text-white"></i>
</button>
{{ /sc:cart:removeItem }}
{{ /if }}