EmEditor Macro to Save Large Files from 0 to 100000

Trying to set up a macro for EmEditor to execute the following steps that I could otherwise do manually.

1. open file
2. view > large file controller
3. set To=1000
4. Click Apply
5. Click Save Opened Portion As...
6. Enter TestMacro and Save

I'm using: EmEditor Professional (64-bit) version 22.4.1. Windows 10 operating system.

I tried recording, that didnt seem to work.

Then I tried variations of this snippet suggested as answer but error provided was specificed file does not exist.

editor.WriteProfileInt( eeRegCommon, "", "DefaultBytesTo", 1000 );    // open to 1000 bytes
editor.RefreshCommonSettings();
editor.OpenFile( "D:\\Test\\Input.txt", 0, eeOpenDetectUnicode | eeOpenDetectUTF8 );
editor.WriteProfileInt( eeRegCommon, "", "DefaultBytesTo", 0 );       // open to unlimited
editor.RefreshCommonSettings();
editor.ExecuteCommandByID(4323);  // Clear All Bookmarks in This Document
editor.ExecuteCommandByID(4588);  // Invert Bookmarks in This Document
editor.ExecuteCommandByID(4590);  // Extract Bookmarked Lines in This Document to New File
document.Save( "D:\\Test\\TestMacro.txt" );

How is this macro set up to achieve these steps?

After editing my file path to "input" instead of "input.txt" error was resolved.

I wrote a macro to open a file E:\Test\Input.txt to 1000 bytes, and save it as E:\Test\TestMacro.txt.

Notes:

• You can also change the default To bytes in the File page of the Customize dialog box, but this macro will change this only while opening the file, and revert it to default automatically when done.
• There is no macro method equivalent to Save Opened Portion As, but you can set bookmarks to all lines, extract bookmarked lines to a new file, and then save the new file as TestMacro.txt.

editor.WriteProfileInt( eeRegCommon, "", "DefaultBytesTo", 1000 );    // open to 1000 bytes
editor.RefreshCommonSettings();
editor.OpenFile( "E:\\Test\\Input.txt", 0, eeOpenDetectUnicode | eeOpenDetectUTF8 );
editor.WriteProfileInt( eeRegCommon, "", "DefaultBytesTo", 0 );       // open to unlimited
editor.RefreshCommonSettings();
editor.ExecuteCommandByID(4323);  // Clear All Bookmarks in This Document
editor.ExecuteCommandByID(4588);  // Invert Bookmarks in This Document
editor.ExecuteCommandByID(4590);  // Extract Bookmarked Lines in This Document to New File
document.Save( "E:\\Test\\TestMacro.txt" );