AB lines being added when updating to the latest release

Hi just downloaded the 6.8.6 but was using the 5.7.2 tried to and the fields and ab lines but they dont show up only when i load the klm file it find loads of ab lines and curves lines does anyone know how can i delete the other ab lines that isnt 1 by 1 as there is 100 plus section lines in each field and i have probable 100 fieds do do this in agshare it uploads the same lines