How do I combine two lines of a polygon's table?

[VincentBelanger]

It is probably an easy newbie question:
How do I combine two lines of a shapefile polygon's table?

In this exemple, I want to combine the lines with the FIDs 2 and 3 togheter (the two selected ones)
How do I do that?

[VincentBelanger]

I forgot to indicate that I am trying to make them "one" object and that I'm on ArcMap!

[Dale_Honeycutt · Accepted solution]

Take a look at the geoprocessing Dissolve tool.  Dissolve creates a new feature class by merging together adjacent polygons (polygons that share a border) that have the same attribute.  In your case, it looks like you'd dissolve on the md_tempora field.  In your example above, it would merge the 3 polygons that make up the lake (I notice you have 2 polygons selected, but it looks like 3 polygons make the lake)

[RichardHowe · Accepted solution]

Editor toolbar. Start an edit session. Highlight the two polygons (as you have in your screenshot) and choose "merge" from the editor dropdown menu, then pick the record containing the set of attributes you wish to keep

[VincentBelanger]

Cool! Thx friend!