Q. A bris milah is a seudas mitzvah. Does this apply even if one is not able to stay for the seuda, but takes food and eats it on his way to work, or saves it for lunch or supper? The naf kamina (difference) would be during 9 Days - if one took food from a bris, which was meaty, can he eat it on his way to work (no longer at the location of the bris)? Or if one made a vow to eat bread only by a seudas mitzvah, can he take bread from the bris and eat it later on in the day, or only at the location of the bris? There are many people who take food from a bris, whether to eat on the way to work or to give to others.
A. Horav Shlomo Miller’s Shlit”a opinion is that a seudas mitzva is basically considered as such, only in the place designated for the seuda to take place. Nonetheless, there is still an inyan and spiritual benefit to share and partake with others the remnants of that seuda, when permission is granted to take with the remnants.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a