Breast feeding

My daughter is 8 months. I have started working and going back to school but I’m struggling to make her take a bottle I have tried changing the bottle and nothing works I tried doing only formula im hopes of her taking a bottle but haven’t had any luck. If anyone knows way to make her a take bottle while I’m at work. I don’t want to take her completely off breastfeeding but I do need her to take a bottle since she won’t drink any milk until she sees me