Is there any way to combine two non-contiguous polygons into a single layer, I have tried merge from editor tool, but i cannot select multiple shape files by clicking shift key, dissolve tool is also not helping. Is there any other way?
Merge from Editor tool is to merge two or more feature parts of a single layer.
If the schema of both the polygons are same,
1. you could select the polygon of one layer and copy
2. Start editing the other layer and paste to the second layer.
You should first Append (GP tool) them into on layer and then use merge.
Is this a one-off task or something you will be doing dozens or hundreds of times? If the former, I think using a manual method as proposed by Jayanta Poddar is the way to go. However, any manual method will quickly get onerous if you are planning on doing this time and again.
Depending upon your data and how many of these need to be done, one approach could be to Dissolve (Data Management) with the Create multipart features (optional) setting checked on. Note the tool includes the ability to Dissolve based on a specific field in the data, so that can help differentiate what should be combined.
ArcGIS Desktop - Dissolve
Chris Donohue, GISP
Retrieving data ...