Hi,
My hold works. I will paste the code I used. UTREV is the holding fix, I paused BS at the 1min after the outbound turn (to get the coordinates) and created a wpt In called UTRHD, this is the end of the outbound leg for a 210kts restriction. The rest is self explanatory. I did not do the sector join, but started at the holding fix. Turns are standard rate 1.

00:00:00.00> HOLD
00:00:00.00> TIME REAL

Create Flight(s)

00:00:0.00>CRE HOLD1,A346,UTREV,100 ,6100,210

00:00:00.00>ADDWPTMODE hold1, FLYOVER

00:00:00.00>ADDWPT HOLD1 UTRHD
00:00:00.00>ADDWPT HOLD1 UTREV

Approach - GNSS 19

00:00:0.00>ADDWPTMODE hold1, FLYBY
00:00:00.00>ADDWPT HOLD1, CT2T1, 4500 , 190
00:00:00.00>ADDWPT HOLD1, CT2f1, 2700 , 160
00:00:00.00>ADDWPT HOLD1, CT2SD, 1550 ,
00:00:00.00>ADDWPT HOLD1, RW19 , 120 ,
00:00:00.00>ADDWPT HOLD1, RW01 , 0 ,

Stopping on runway

00:00:00.00>HOLD1 ATDIST RW01,1.5,HOLD1 ALT 0
00:00:00.00>HOLD1 ATDIST RW19,2.0,HOLD1 SPD 0

00:00:00.00>HOLD1 LNAV ON

00:00:00.00>TRAIL On 2

hold @ UTREV - Added UTRHL as the end of outbound 1min leg

UTREV hold is outbound 280 and 1min legs@ 6100alt

set trail to dt=2 for smooth displayed pattern.

Based on 210kts 1min approx 3.5nm, 160kts approx 2.7nm, 100kts approx 1.7nm

00:00:00.00>HOLD1 HDG 280
00:00:00.00>HOLD1 AT UTRHD,stack HOLD1 direct utrev
00:00:00.00>HOLD1 AT utrev,stack HOLD1 direct utrhd**
00:04:30.00>TRAIL off
#Commence the GNSS App (Manual operation)

While somewhere in the Hold :

HOLD1 direct UTREV

HOLD1 AT UTREV STACK HOLD1 DIRECT CT2T1; HOLD1 VNAV on

Not sure you can add a second scenario while the first is running, that's the manual part. Tried to make it work with ATDIST etc. but it became a bit "messy" :-)