Greetings,
1. Do you have Schedual and invoicing? I do and i can change all my work orders to completed with one button click. Re configure the button on that screen to accpet all activities and you would be set.
2. The other option is to create a simple grid from the activities table and make the grid so you can edit it.
3. Complete #2 then add a update button that will change them with a button click.
There are some good programmers out there that could help you with this. I dont work for Method but I use this program alot.
John M