May one eat bread only by the beginning of a meal - Part 1

• Example #1: On Erev Pesach that falls on Shabbos, may one split his meal to two, eating Chametz in the first part of the meal, and eating Kosher for Pesach foods in the second part of the meal? For example, by night, may one eat Chametz only for Hamotzi and then clear the bread and serve the rest of the food either on that table or in a different area of the house? Also, by Shabbos day, may one continue eating Pesach foods after Sof Zeman Achilas Chametz and then Bentch?
• Example #2: May one serve Matzah only in the beginning of the meal prior to serving any other foods in order to avoid Gebrochts?

When Erev Pesach falls on Shabbos, may one split his meal in two, and eat bread only by the beginning of the meal? – Shulchanaruchharav.com