{\1a&Hff\2a&Hff\3a&Hff\4a&Hff}{\t(9,2094,1.0,\1a&H00)}{\t(9,2094,2.0,\3a&H00)}{\t(9,2094,4.0,\4a&H80)}
{\fad(2094,0)}
.
For the optimal results, you may need to further tweak some parameters manually, for example the accel parameters.
For example, suppose the current Dialogue is:
Dialogue: 0,0:00:01.75,0:00:08.00,SomeStyle,,0000,0000,0000,,Text
and the current time is 0:00:06.33. Then Split will generate the following 2 Dialogues and send them to the clipboard:
Dialogue: 0,0:00:01.75,0:00:06.33,SomeStyle,,0000,0000,0000,,Text
Dialogue: 0,0:00:06.33,0:00:08.00,SomeStyle,,0000,0000,0000,,
Join Next will join the current Dialogue and the next (according to line numbers) Dialogue and make one Dialogue. Join Prev will join the previous Dialogue and the current Dialogue.