removing a sub -subfield

I have a vendor who is sending data in a sub-subfield (tilde separated) that I have tried to write a translation to remove. Instead of removing the sub- subfield it removes the item before it.

Here is how the segment looks:

FT1|1|10||200910020850|200909300047|CH|36080023^TR LAP CHOLE^HL70132~50267^TR LAP CHOLE^HL70132|TR LAP CHOLE|TR LAP CHOLE|1|||0204420^^HL70049|||^^^M10||IP|||||2

I am trying to remove the ~50267.

I tried this in my xlate

= >{0(0).FT1(0).00361.[2].[1]}

When tested it removes everything in field 7 but the tilde and the number in this sub-subfield.

I do not know the correct format for dealing with sub-subfields.  I know for just a subfield you utilize brackets [ but not sure what to use for sub-subfields.