What is the process of copying the dimension styles from one drawing to another in Autocad?

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Copying of dimension styles require setting up the particular dimension style. To copy a dimension style, a new document has to be created. Once it is created, this document will be saved as a drawing template. A new reference will be created by new drawing template document and it will show all the options like layer style, units and blocks. Drawing can be done by seeing the current drawing and dimension style would be same as the original picture. By using the design center, Autocad tools can be used to copy the dimension styles from one drawing to another

You can use DIMEX and DIMIM commands for exporting a group of dimension styles in between two or more drawings.

You can also use Design Centre (DC enter) to import all kinds of styles, layers, hatches, blocks, etc...

You can use the Express Tools command pair DIMEX and DIMIM to export and import your dimension style settings to/from a .DIM text file.

You can also drag-and-drop Dimstyles from your DesignCenter window (Ctrl+2).

For individual styles you can also just copy a dimension object from the source drawing and paste it into the target drawing - its dimstyle is copied along