you're not going to want to try manually re-building the areas you have marked. you're best bet is to start again and make a new boolean object. booleans tend to result in pretty messy complex geometry that can't be smoothed or re-worked very easily. you really need to carefully plan ahead and get it to work in one step.

---

hmm ok thanks alot

---

any idea as how to do it instead? is there some other method i can use ? i want the same shape as showed but perhaps that would be possible without boolean?

thanks in advance

---

There are other ways but honestly a boolean is really the best option for this shape.
I would suggest creating some capsule objects with quite a lot of detail in them and placing them just inside the larger cylinder around the edge. then create your five internal cylinders and use pro boolean to pick them all one by one. make sure all the objects are as detailed as they will need to be in the final mesh because you cant smooth the result. It would be better to have cap segments in your larger cylinder aswell. Setting up the two meshes to take the detail will result in a cleaner boolean operation.

Alternatively you could try using turbosmooth ontop of a low res cage, using extrude, inset bevel etc. but thats going to take some time and know how to get it working well. doing it that way would yield a nicer mesh for picking up reflections and highlights though.

---

---