Hi Guys

I have a DUB to SFO coming up for business. This cheaper then booking LHR to SFO via PHL - and I've then got a separate LHR to DUB booking.

Does anyone know, if when checking in BA are able to merge the bookings, so instead of collecting my bags in DUB and re-checking them in, if it's possible to get them from LHR to PHL - even though that route is across two bookings?

Thanks!
N