Yep... Make a group... We'll call it "Triple Lamp" for this discussion... it works by description but you can name it "General Custer" if you want... name doesn't matter as much as making a group. Once you create the group, Alexa will ask which devices you want in this group (by showing you the lost of all smart home devices you have and probably every scene you have set up as well). Choose the Bulbs that are actually in that lamp and save your settings.
Once that's done All you have to do for control of that Specific lamp is to call out commands of "Alexa, Turn on Triple Lamp" or "off" or "Alexa, Turn Triple lamp to 50%"... stuff like that.
You can also include those same bulbs in another group for the room they're in, for example, if "triple lamp" is in the Great room of your house, You can control all bulbs in the Great room by creating yet another group and instead of separating all of the bulbs, pick all of the bulbs in that room and save that group as well. In my system, I have a 'whole house" group so I can light up or shut down every bulb in my Alexa ecosystem all at once. I have multiple groups that include the same lamps, bulbs and more as well.It's all in the set up and how you command them.