For all amounts which use the planning pages, do 1 1/2 times the amount for 100.

5 different kinds of appetizers. 2 bites of each kind per person

cold meat trays, depends on the time of day and length of reception. If mid afternoon, use reception level on the sandwich page, if over a mealtime, use meal level. Suggestions for assortments are on that page.
buns, 1 1/2 large or 2 smallish per person

cheese and cracker trays, 1 pound cheese per 10, some sliced for sandwiches, some can pe spreads or logs
pickles, 1 1/2 gallon, at least some sweet
You need other sandwich fixings, see the condiments list on the sandwich page

potato salad, about 7 gallons
coleslaw, about 3 1/2 gallons
Caesar salad, use plan for 100 page

veggie trays, with this spread, suggest 1 1/2 classic relish trays and fresh with dip for 100, see the veggie tray page
fruit trays, deluxe fruit tray for 100 plus a couple of extra quarts of strawberries, see fruit tray page

dessert bars, see dessert planning page. Cut 2-3 bite size, not large, and have at least 1 of at least 3 different items per person