to be here和from your part of the world没有关系

删掉了也是一样的

I want to warmly welcome our friends who have come all the way to be here.(删掉from your part of the world)

I want to warmly welcome our friends who have come all the way from your part of the world.(删掉to be here)

这里to后接的内容和from的内容显然不是同一属性的概念

那么to自然就不和from组成from…to…的介词短语来表示范围的限定

Let's rate the design from one to ten.(from…to…介词短语)

There's no station to stop by from Shanghai to Beijing on the high-speed train.(from…to…介词短语)

I want to warmly welcome our friends who have come all the way from your part of the world to be here.(from…作地点状语，to…作目的状语)

自己比较一下三者区别很明显就出来了