is quantity the same as meters in this cart?
you can congure shipping charges in the eCart object on the shipping tab.
with your cart display page open, go to Window -> Server Behaviors, in the server behaviors panel, click the eCart Object to open the eCart object editor.
go to the shipping tab to set shipping rules.
your shipping rules will use the "Subtotal for any column" option for the trigger
and a flat rate shipping charge.
for example, to set up the 1m charge:
triggers:
Subtotal for any column - if the subtotal of column 'Quantity' is '=' a value of '1'
flat rate charge of 2
for the 2 - 20 charge:
triggers:
Subtotal for any column - if the subtotal of column 'Quantity' is '>=' a value of '2'
AND
Subtotal for any column - if the subtotal of column 'Quantity' is '<=' a value of '20'
flat rate charge of 5
