Step 1.
Plus sign can add multiple source of address together.
Minus sign can split address into different purpose group.
neutral sign simple combine 2 source of address together without filter out duplicate

Step 2.
Note:
apartment and unit have same address, but different unit number. Some time, county missing unit number, as a result is you see a bunch of "same" address, they are not same, county just missed assign unit number.
These looks like same address, actually is NOT same. Should be keep as is.
When use these tools, should bypasss these unit related address.
a bunch of 6013, looks like the same address,
but actually they are not same, they have different unit number,
however, county tax department, somehow only record some of unit number, also missing a few, see red arrow, this kind of things is very often cross the los angeles county.

Step 3.
current repository
https://transparentgov.net/json2tree/esri/geojson/dir.html?dir=.%2Faddress%2F2025&model=addr-no-map

Step 4.
current repository
https://transparentgov.net/json2tree/esri/vendor/refinery/addr-url.html?url=https%3A%2F%2Ftransparentgov.net%2Fdata%2Fsample%2Fgeojson%2Faddress%2F2025%2Faddr_2025.geojson

Step 5.
micro-station address
https://transparentgov.net/json2tree/esri/geojson/dir.html?dir=.%2Faddress%2Fmicro-station&model=addr-no-map

Step 6.
micro-station address
https://transparentgov.net/json2tree/esri/vendor/refinery/addr-url.html?url=https://transparentgov.net/data/sample/geojson/address/micro-station/addr-micro-station.geojson

Step 7.
To combine 2 source of address, use + plus sign

Step 8.
combine-2025-with-micro-station,
standard is result of combine
https://transparentgov.net/json2tree/esri/geojson/dir.html?dir=.%2Faddress%2Fcombine-2025-with-micro-station&model=addr-no-map

Step 9.
combine-2025-with-micro-station,
standard is result of combine
https://transparentgov.net/json2tree/esri/vendor/refinery/addr-url.html?url=https://transparentgov.net/data/sample/geojson/address/combine-2025-with-micro-station/standard.geojson

Step 10.
check result in arcgis pro.
6204 is missing in county tax parcel address. ( total 7322 ) red dot
however, 6204 was captured in micro-station. ( total 8799 ) red triangle
when you combine 7322 + 8799 = 10569 (blue circle)
combine result capture it (blue circle on red triangle)

Step 11.
test minus tool
micro-station. ( total 8799 ) red triangle
county tax parcel address. ( total 7322 ) red dot
8799 - 7322 = 3295
3295 address missing from county tax address by compare with micro-station address.

Step 12.
micro-station. ( total 8799 ) red triangle
county tax parcel address. ( total 7322 ) red dot
8799 - 7322 = 3295
3295 address missing from county tax address by compare with micro-station address.
https://transparentgov.net/json2tree/esri/geojson/dir.html?dir=.%2Faddress%2Fcombine-2025-with-micro-station%2Fmicro-station-minus-2025-result&model=addr-no-map

Step 13.
3295 address missing from county tax address by compare with micro-station address.
https://transparentgov.net/json2tree/esri/vendor/refinery/addr-url.html?url=https://transparentgov.net/data/sample/geojson/address/combine-2025-with-micro-station/micro-station-minus-2025-result/standard.geojson

Step 14.
in theory, if you combine 7322( tax address ) with 3295 ( tax address missing from micro-station),
you should get same result 10569
let's test
it is 10569.

Step 15.
summary, use plus sign, minus sign, you can combine or split address from different source.
.