The first time baby tries solid food, baby won’t take a lot, because they need to learn how to receive the spoon and how to process the food in the mouth, swallow, etc.
This is just my way, but at the beginning, I would feed some milk first before giving the solids, then before the nap, I would feed a little more milk. (I did it this way because my baby naturally doesn’t drink a lot of milk at one shot).
After a while, when my LO ate a lot more, then I considered that a meal and separated the milk feeding:)