Your BoA LOC is figured into your revolving credit. You can also call BoA and ask to put some or all of the LOC limit onto a CC if you have one with them.
In the end it is your choice to keep it open or not but I would certainly see abt transferring the limit to the CC.
Also, if you close it and in a year you need to use it again it will be a hard pull to open another LOC. Well sometimes BoA uses internal (at least i have found this) info or soft pulls if you are a long time in good standing customer. Good Luck Vicki