Regarding ALV

Hi,

1- In Editable ALV, How to select multiple columns. I have changed the selection of component context to 0..n, but even its not allowing me to do multiple selection. What else i need to do.

2- In editable ALV, how to delete multiple columns, bcoz i think with toolbar button we can only delete one row at a time...?

3- If we want to use editable ALV to enter the data, is there any way that we can make all the rows editable initially...or whats the professional way to handle this situation.

Thanks,