Write in a edge by 2 nodes?

Dear Sir,
I want to know that , if it is possible to write in Single Edge by 2 Nodes???

A B
| |
\ /
\ /
|
C

Means,if both A and B nodes, can write in a single Edge , that is input edge to C.

That is not possible because some general rules Clover obeys. Edge is always 1:1 connection between two Nodes (two ports on two Nodes).

To be able to merge two data flows from two different Nodes into third, you need to use appropriate component which can perform it - like MERGE, JOIN, GATGER - depends, whether you just need to combine them or need to combine based on common key value, etc.
Check clover examples which show various scenarios where merging occures.