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Can a dissolve feature create a multi part feature?
Dissolve may or may not create multi-part features. Features which share common geometry (such as two separate lines with a common endpoint, or two adjacent polygons with a common edge) will be combined regardless of whether multi-part creation is allowed. Multi-parts (if allowed) will result from any non-connected geometry.
How to divide multipart polygon into many polygons?
Your approach is almost correct. Singleparts to multipart from vector menu is (from version 2.16) using same tools as in processing toolbox, and as other processing tools from toolbox takes only selected features from input vector data by default. This can be configured in menu Processing -> Options….
How to reconstruct a multipart from a singlepart?
To reconstruct multipart features from singlepart features based on a common field value, such as ORIG_FID, use the Dissolve tool. A multipatch feature will be separated into its constituent geometry parts. Each part can be defined by a collection of vertices containing X, Y, and Z coordinates that are arranged as:
Which is the result of singleparts to multipart?
Multi-parts (if allowed) will result from any non-connected geometry. Singleparts to Multiparts would not combine any existing geometry. It would simply create multi-part features, collapsing the rows/records for all of the geometries into a single row.
To reconstruct multipart features from singlepart features based on a common field value, such as ORIG_FID, use the Dissolve tool. A multipatch feature will be separated into its constituent geometry parts.
How does multipart to singlepart work in ArcGIS?
A new field, ORIG_FID, will be added to the output feature class and set to the input feature IDs. Each part of a multipart feature will be separated into individual features in the output feature class. Features that are already singlepart will not be affected.