Basically, yes. And I did it precisely because I am a strong believer in moderately extended breast-feeding and in breast-milk ONLY for babies until their teeth start coming in. (I say "moderately" extended because while I think twelve to twenty-four months is a good normal period for breastfeeding, I do think it's a little weird to breastfeed a child whose contemporaries are learning to read. JMHO)
I knew that I would be going back to work full-time when my baby was only six months old, so right from the beginning I began expressing and freezing breastmilk. I didn't express much at first, as let-down and expressing are both learned skills. As soon as I had two ounces, Dean gave Anne her next night-time feeding and I got to sleep through it. By the time she settled into once-every-three hours as a nighttime feeding schedule, I was routinely able to sleep six hours at a stretch because of this practice.
I could never bottle-feed Anne. She smelt me and the milk in my breasts and wanted the breast. But she took the bottle easily from Dean. He always bottle-fed her by holding her very close and holding the bottle, so that the emotional benefits of breast-feeding were maintained, and it gave him a chance to bond more closely than many fathers ever get a chance to bond.
So, when I went back to work, I was able to take breast-milk in bottles for the nuns to give to Anne. They held her the same way for feeding, and never had any trouble with her fretting or rejecting the bottle.
I was careful always to use silicone nipples because they don't smell or deteriorate as latex nipples do; always to use the orthodontic nipples and keep them scrupulously clean, use the smallest available holes in the nipple to keep the sucking reflex strong, and to use the kind of bottles that support a little plastic-bag insert that collapses as the baby suckles and therefore don't introduce any air into the baby's stomach. I froze the expressed milk right in those little plastic bags, so that there was just the right amount in each frozen package (I kept one of the "bottles" in the freezer and added expressed milk little by little until it was full and frozen, then tied it off and popped it into a zip-lock bag. This way the frozen lumps fit easily back into the bottle and could thaw slowly in the fridge at the convent until needed -- write the date on the bottle-liner.)