Enable M value

[LilingLyu]

Hi all, 

I have imported some polyline data and plan to use linear referencing. However, I cannot find M value nor can i edit it. 

Can anyone help please? 

If useful - I have version 3.0.4 ArcGIS Pro installed.

Cheers

[DanPatterson · Accepted solution]

untried, but in theory should work

create an empty featureclass ensuring that you m-enable it.

use the Append tool to append the records from the other polyline to it

[LilingLyu · Accepted solution]

Thanks Dan,

I realised that I should try turning the lines into routes. It now works. 

The function I used is "create routes". thanks for your reply!