SubCap is a open captioning tool creating subtitles. For close captioning, follow this from the internal help guide in MC:
Importing Scenarist Closed Caption Files
The editing application supports importing Scenarist Closed Caption (.scc) files. SCC files provide a textual representation of the Line 21 closed caption format, and can be used to generate closed captions.
To import .scc files:
1. Select File > Input > Source Browser.
2. Select the Import button.
3. Navigate to the location of the .scc file and either drag and drop the file to the bin or select the Target Bin at the bottom right of the Source Browser window and click Import. The AncData Import dialog box opens. The starting timecode and drop frame checkbox will be automatically populated with the applicable information from the selected .scc file.
4. Click OK to accept these values so the clip and associated meta-data will match the contents of the SCC file. The .scc file appears in your target bin. It can be added to the Timeline just like any other clip. However it is a D-track only clip that contains only the 608 compatibility bytes from EIA-708.