How to Use the “Replace Feature” function
Imagine a part file has a block with a cylinder united to it. The united cylinder for this example is “blue”, then we will add a block that will call it “green”, the block (green) is not united. When we are done the result will be the block (green) will be united to the original block and the cylinder (blue) will be removed.
Replacing the feature
Select “Replace Feature”
Edit -> Feature -> Replace
Summary
The finished result is the block (green) replaces the cylinder (blue). The advantage of this is if there was any additionaly child features applied to the original cylinder, it will be associated to the new block (in this case). So if you had a hole it would be in the new feature with the hole having the same face ID. In the master model concept child operations depending on the face ID would not need to be re-associated. Example would be a CAM process associated to the hole. Update it and it’s done.